Etymology

thesis (n.)

late 14c., "unaccented syllable or note, a lowering of the voice in music," from Latin thesis "unaccented syllable in poetry," later (and more correctly) "stressed part of a metrical foot," from Greek thesis "a proposition," also "downbeat" (in music), originally "a setting down, a placing, an arranging; position, situation" (from reduplicated form of PIE root *dhe- "to set, put").

The sense in logic of "a formulation in advance of a proposition to be proved or debated" is attested by 1570s (contrasted to hypothesis ; in rhetoric it is opposed to antithesis ); that of "dissertation presented by a candidate for a university degree" is from 1650s. The uncertainty of the prosodic sense might have kept it from being established in English. Related: Thetic ; thetical ; thetically .

Entries linking to thesis

*dhē- , Proto-Indo-European root meaning "to set, put."

It forms all or part of: abdomen ; abscond ; affair ; affect (v.1) "make a mental impression on;" affect (v.2) "make a pretense of;" affection ; amplify ; anathema ; antithesis ; apothecary ; artifact ; artifice ; beatific ; benefice ; beneficence ; beneficial ; benefit ; bibliothec ; bodega ; boutique ; certify ; chafe ; chauffeur ; comfit ; condiment ; confection ; confetti ; counterfeit ; deed ; deem ; deface ; defeasance ; defeat ; defect ; deficient ; difficulty ; dignify ; discomfit ; do (v.); doom ; -dom ; duma ; edifice ; edify ; efface ; effect ; efficacious ; efficient ; epithet ; facade ; face ; facet ; facial ; -facient ; facile ; facilitate ; facsimile ; fact ; faction (n.1) "political party;" -faction ; factitious ; factitive ; factor ; factory ; factotum ; faculty ; fashion ; feasible ; feat ; feature ; feckless ; fetish ; -fic ; fordo ; forfeit ; -fy ; gratify ; hacienda ; hypothecate ; hypothesis ; incondite ; indeed ; infect ; justify ; malefactor ; malfeasance ; manufacture ; metathesis ; misfeasance ; modify ; mollify ; multifarious ; notify ; nullify ; office ; officinal ; omnifarious ; orifice ; parenthesis ; perfect ; petrify ; pluperfect ; pontifex ; prefect ; prima facie ; proficient ; profit ; prosthesis ; prothesis ; purdah ; putrefy ; qualify ; rarefy ; recondite ; rectify ; refectory ; sacrifice ; salmagundi ; samadhi ; satisfy ; sconce ; suffice ; sufficient ; surface ; surfeit ; synthesis ; tay ; ticking (n.); theco- ; thematic ; theme ; thesis ; verify .

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dadhati "puts, places;" Avestan dadaiti "he puts;" Old Persian ada "he made;" Hittite dai- "to place;" Greek tithenai "to put, set, place;" Latin facere "to make, do; perform; bring about;" Lithuanian dėti "to put;" Polish dziać się "to be happening;" Russian delat' "to do;" Old High German tuon , German tun , Old English don "to do."

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Definition of thesis

Did you know.

In high school, college, or graduate school, students often have to write a thesis on a topic in their major field of study. In many fields, a final thesis is the biggest challenge involved in getting a master's degree, and the same is true for students studying for a Ph.D. (a Ph.D. thesis is often called a dissertation ). But a thesis may also be an idea; so in the course of the paper the student may put forth several theses (notice the plural form) and attempt to prove them.

Examples of thesis in a Sentence

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'thesis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

in sense 3, Middle English, lowering of the voice, from Late Latin & Greek; Late Latin, from Greek, downbeat, more important part of a foot, literally, act of laying down; in other senses, Latin, from Greek, literally, act of laying down, from tithenai to put, lay down — more at do

14th century, in the meaning defined at sense 3a(1)

Dictionary Entries Near thesis

the sins of the fathers are visited upon the children

thesis novel

Cite this Entry

“Thesis.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/thesis. Accessed 28 Aug. 2024.

Kids Definition

Kids definition of thesis, more from merriam-webster on thesis.

Nglish: Translation of thesis for Spanish Speakers

Britannica English: Translation of thesis for Arabic Speakers

Britannica.com: Encyclopedia article about thesis

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thesis noun

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What does the noun thesis mean?

There are seven meanings listed in OED's entry for the noun thesis . See ‘Meaning & use’ for definitions, usage, and quotation evidence.

thesis has developed meanings and uses in subjects including

Entry status

OED is undergoing a continuous programme of revision to modernize and improve definitions. This entry has not yet been fully revised.

How common is the noun thesis ?

How is the noun thesis pronounced?

British english, u.s. english, where does the noun thesis come from.

Earliest known use

Middle English

The earliest known use of the noun thesis is in the Middle English period (1150—1500).

OED's earliest evidence for thesis is from before 1398, in a translation by John Trevisa, translator.

thesis is a borrowing from Greek.

Etymons: Greek θέσις .

Nearby entries

  • thesaurus, n. 1823–
  • thesaury, n. a1639–1708
  • these, n. a1600–48
  • these, pron. & adj. Old English–
  • Thesean, adj. 1815–
  • Theseid, n. 1725–
  • Theseium, n. 1819–
  • these-like, adj. 1644–
  • thesial, adj. 1654
  • thesicle, n. 1863–
  • thesis, n. a1398–
  • thesis-novel, n. 1934–
  • thesis-play, n. 1902–
  • thesmophilist, n. 1644–
  • Thesmophorian, adj. 1891–
  • Thesmophoric, adj. 1788–
  • thesmothete, n. 1603–
  • thesocyte, n. 1887–
  • thesp, n. 1962–
  • Thespian, adj. & n. 1675–
  • Thespianism, n. 1914–

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Meaning & use

Pronunciation, compounds & derived words, entry history for thesis, n..

thesis, n. was first published in 1912; not yet revised.

thesis, n. was last modified in December 2023.

Revision of the OED is a long-term project. Entries in oed.com which have not been revised may include:

  • corrections and revisions to definitions, pronunciation, etymology, headwords, variant spellings, quotations, and dates;
  • new senses, phrases, and quotations which have been added in subsequent print and online updates.

Revisions and additions of this kind were last incorporated into thesis, n. in December 2023.

Earlier versions of this entry were published in:

OED First Edition (1912)

  • Find out more

OED Second Edition (1989)

  • View thesis in OED Second Edition

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Citation details

Factsheet for thesis, n., browse entry.

  • 1.1 Etymology
  • 1.2 Pronunciation
  • 1.3.1 Derived terms
  • 1.3.2 Related terms
  • 1.3.3 Translations
  • 1.4 References
  • 1.5 Further reading
  • 1.6 Anagrams
  • 2.1 Etymology
  • 2.2 Pronunciation
  • 3.1 Etymology
  • 3.2 Pronunciation
  • 3.3.1 Declension
  • 3.3.2 Descendants
  • 3.4 References

From Late Middle English thesis ( “ lowering of the voice ” ) [ 1 ] and also borrowed directly from its etymon Latin thesis ( “ proposition, thesis; lowering of the voice ” ) , from Ancient Greek θέσῐς ( thésis , “ arrangement, placement, setting; conclusion, position, thesis; lowering of the voice ” ) , from τῐ́θημῐ ( títhēmi , “ to place, put, set; to put down in writing; to consider as, regard ” ) [ 2 ] [ 3 ] (ultimately from Proto-Indo-European *dʰeh₁- ( “ to do; to place, put ” ) ) + -σῐς ( -sis , suffix forming abstract nouns or nouns of action, process, or result ) . The English word is a doublet of deed .

Sense 1.1 (“proposition or statement supported by arguments”) is adopted from antithesis . [ 2 ] Sense 1.4 (“initial stage of reasoning”) was first used by the German philosopher Johann Gottlieb Fichte (1762–1814), and later applied to the dialectical method of his countryman, the philosopher Georg Wilhelm Friedrich Hegel (1770–1831).

The plural form theses is borrowed from Latin thesēs , from Ancient Greek θέσεις ( théseis ) .

Pronunciation

  • ( Received Pronunciation ) IPA ( key ) : /ˈθiːsɪs/ , ( archaic ) /ˈθɛsɪs/
Audio ( ): ( )
  • ( General American ) IPA ( key ) : /ˈθisɪs/
  • Rhymes: -iːsɪs
  • Hyphenation: the‧sis
  • ( Received Pronunciation ) IPA ( key ) : /ˈθiːsiːz/
  • ( General American ) IPA ( key ) : /ˈθisiz/
  • Rhymes: -iːsiːz
  • Hyphenation: the‧ses

thesis ( plural theses )

  • ( rhetoric ) A proposition or statement supported by arguments .
  • 1766 , [ Oliver Goldsmith ], “The Conclusion”, in The Vicar of Wakefield:   [ … ] , volume II, Salisbury, Wiltshire: [ … ] B. Collins, for F [ rancis ] Newbery ,   [ … ] , →OCLC , pages 218–219 : I told them of the grave, becoming, and ſublime deportment they ſhould aſſume upon this myſtical occaſion, and read them two homilies and a theſis of my own compoſing, in order to prepare them.
  • ( mathematics , computer science ) A conjecture , especially one too vague to be formally stated or verified but useful as a working convention.
  • ( logic ) An affirmation , or distinction from a supposition or hypothesis .
  • ( philosophy ) In the dialectical method of Georg Wilhelm Friedrich Hegel : the initial stage of reasoning where a formal statement of a point is developed ; this is followed by antithesis and synthesis .
  • ( music , prosody , originally ) The action of lowering the hand or bringing down the foot when indicating a rhythm ; hence, an accented part of a measure of music or verse indicated by this action; an ictus , a stress . Antonym: arsis
  • ( music , prosody , with a reversal of meaning ) A depression of the voice when pronouncing a syllables of a word ; hence, the unstressed part of the metrical foot of a verse upon which such a depression falls , or an unaccented musical note .

Derived terms

  • all but thesis
  • bachelor's thesis
  • Church-Turing thesis
  • conflict thesis
  • doctoral thesis
  • graduate thesis
  • Habakkuk thesis
  • master's thesis
  • Merton thesis
  • private language thesis
  • thesis defense
  • thesis statement

Related terms

Translations.

  (tʻez)   ,   (tézis),   (palažénnje),   (téza)     (téza),     (tézis)     (leon dim ), (leon tai )   (lùndiǎn),   (lùntí)       ,             ,             (tezisi)       (thésis)       ,       (tēze),   (ろんだい, rondai),   (しゅちょう, shuchō),   (ていりつ, teiritsu) (teje), (nonje), (ronje) (North Korea)     (teza)                 (tɛ́zis),     (položénije)                   ,   ,   ,   ,     (téza),   (tézys),   (polóžennja)  
  (ʔuṭrūḥa)   (atenaxosutʻyun),   (disertacʻia), (diplomayin ašxatankʻ)     (dysjertácyja),   (dysertácyja),   (dyplómnaja rabóta)     (disertácija)     ,     (leon man )   (lùnwén)     ,       ,     ,       ,   ;   ;           ,   (diserṭacia)     ,     ,     ,     ,     ,     (only a doctoral thesis) (mahāśodh nibandh)     (téza)   ,   (postgraduate),           (ろんぶん, ronbun) (dissertasiä), (diplomdyq jūmys)   (nɨkkheepaʼbɑt)   (nonmun),   (ronmun) (North Korea) (dissertatsiya)   (wi tha nyā ni phon)         (disertacija)   or     , (pâyân-nâme),       ,           ,         (dissertácija),   (diplómnaja rabóta)         ,     ,         ,     (dissertatsiya)   (wít-tá-yaa-ní-pon),   (bpà-rin-yaa-ní-pon),   (ní-pon)   , ,   (dysertácija),   (dyplómna robóta)   , ,  
  (thésis)  
  • ^ “ thē̆sis, n. ”, in MED Online , Ann Arbor, Mich.: University of Michigan , 2007 .
  • ^ “ thesis, n. ”, in Lexico , Dictionary.com ; Oxford University Press , 2019–2022 .

Further reading

  • “ thesis ”, in The Century Dictionary   [ … ] , New York, N.Y.: The Century Co. , 1911 , →OCLC .
  • “ thesis ”, in Webster’s Revised Unabridged Dictionary , Springfield, Mass.: G. & C. Merriam , 1913 , →OCLC .
  • Heists , Sethis , heists , shiest , shites , sithes , thises

From Latin thesis , from Ancient Greek θέσις ( thésis , “ a proposition, a statement, a thing laid down, thesis in rhetoric, thesis in prosody ” ) .

Audio: ( )

thesis   f ( plural theses or thesissen , diminutive thesisje   n )

  • Dated form of these . Synonyms: dissertatie , proefschrift , scriptie

From Ancient Greek θέσις ( thésis , “ a proposition, a statement, a thing laid down, thesis in rhetoric, thesis in prosody ” ) .

  • ( Classical Latin ) IPA ( key ) : /ˈtʰe.sis/ , [ˈt̪ʰɛs̠ɪs̠]
  • ( modern Italianate Ecclesiastical ) IPA ( key ) : /ˈte.sis/ , [ˈt̪ɛːs̬is]

thesis   f ( genitive thesis ) ; third declension

Case Singular Plural

Descendants

  • → Dutch: thesis
  • → Armenian: թեզ ( tʻez )
  • → Dutch: these
  • → Persian: تز ( tez )
  • → Romanian: teză
  • → Turkish: tez
  • Galician: tese
  • Italian: tesi
  • English: thesis
  • Portuguese: tese
  • Spanish: tesis
  • “ thesis ”, in Charlton T. Lewis and Charles Short ( 1879 ) A Latin Dictionary , Oxford: Clarendon Press
  • thesis in Gaffiot, Félix ( 1934 ) Dictionnaire illustré latin-français , Hachette.

what does the root word thesis mean

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what does the root word thesis mean

Thesis Meaning: Here’s What It Means and How To Use It

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Understanding what a thesis is can help you improve your written and spoken communication.

what does the root word thesis mean

There are countless different contexts where this word is used, and knowing how to properly use it can help you communicate effectively in your field. If you want to be the most effective and successful communicator possible, feel free to read and learn about this essential word ! 

This is everything you need to know about what this word means, where it comes from in etymology, and how it is used.

What Is a Thesis? 

The definition of thesis (ˈθi sɪs, ˈθiːsɪs, the-sis, plural theses) in American English is the main idea presented in an essay. In other words, the central message of the piece. Behind every literary device and rhetorical strategy stands a thesis. Thesis statements don’t just appear at the beginning of your paper; they should be woven into every sentence you write. 

Your thesis statement will probably be one of two things: an assertion that something is true or an argument for why something should be done (or not done). 

What Is a Thesis Statement?

A Thesis statement is a sentence that contains the main idea of a written work.

All other sentences in a paper should explain, prove, or describe this main idea. Thesis statements are often used in reports to express a central message of an essay or article. Researchers commonly use them to propose a hypothesis and then test it with evidence from their study.

What Are Some Synonyms of Thesis?

If you look in a thesaurus for word lists of synonyms for the word thesis, you’ll likely find words including: 

  • Point of View
  • Proposition
  • Dissertation

What Is a Thesis in the Academic World? 

When it comes to the world of academics, the word thesis has another similar yet different meaning. 

A thesis is a long-form piece of writing, often a research paper, that is used as the final project of a university degree, like a master’s degree. 

What Is a Master’s Thesis?

A master’s thesis is a project that contains lots of original research and is used to cap off an academic degree. It is how a student takes an unproved statement and then proves it through extensive writing. 

When Would You Write a Thesis?

If you’re studying a language like Greek, Spanish, Arabic, or Late Latin, you’ll likely have to do an extensive study — and write a thesis — to prove your knowledge of the language. The main goal of a thesis is to establish the synthesis of knowledge that a student is capable of and ensure that they can operate well in the academic world. 

How Do You Start Writing a Thesis?

Before a student or researcher begins writing a paper, they must have a thesis statement. This thesis statement is one sentence that describes how you will support your argument and what evidence you will provide in your paper. In many cases, it is the last sentence of your introduction paragraph and appears again as the first sentence of the body paragraph:

A thesis statement usually evolves only after considerable reading, writing, and thinking has been done on your topic. Your thesis changes and develops as you write it, so by the time you arrive at the end, you will know what your paper is about and should be able to sum it up clearly in a sentence or two.

What Is the Etymology of the Word Thesis? 

The word thesis comes from the Greek word θέσις (thésis), which means “placement” or “setting.” The term was first used in English in 1632 by William Lilly. As time has progressed, the word has entered into many different languages, including Latin tithenai , French, and Middle English. 

Throughout its different stages of development, the word has remained relatively the same. However, this word’s collocations and more specific meanings have gradually changed over the years. 

Luckily, as long as you’re only sticking to English, thesis is a word with meanings that are relatively consistent and easy to understand! 

What Are Some Example Sentences Using the Word Thesis?

One of the best ways to learn how to use a word is by seeing it in use in the context of actual-world sentences and conversations. 

Here are some excellent examples of thesis being used in everyday sentences, so you can start using the word for yourself! 

As he started his conversation, the lowering of his voice enticed everyone to listen intently to his thesis presentation.

The first research stage for her doctoral thesis meant studying the Hegelian people.

Mr. Tese’s master’s thesis primarily focused on a tiny part of a metrical foot in poetry, which was reasonably interesting for many poets.

My entire paper’s central thesis was based on how the downbeat is not the most crucial part of music — the backbeat is.

My professor keeps telling me that the thesis statement is, by far, the most critical part of any essay, and I’m starting to believe her.

It took nearly six months to write the first draft of my thesis, which was really exhausting. 

We’re willing to bet that you have some writing skills if you’re reading this. However, everyone has room to improve when it comes to writing. If you feel like you need to brush up your vocabulary or learn a few additional techniques on writing clearly and effectively, look no further — we are here to help! Let us show you how to get the most out of your communication skills with our resources here on The Word Counter website. 

The Word Counter is a living body of content that will continue to be updated with new and exciting lessons on language, communication, grammar, and writing. We believe everyone can continue to grow in their ability to communicate effectively, and we’ve created this blog as a stepping-stone for precisely that goal. 

Check out our latest articles right here ! 

Sources: 

Thesis Definition & Meaning | Merriam-Webster

Thesis definition and meaning | Collins English Dictionary

Thesis – Definition, Meaning & Synonyms | Vocabulary.com

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Root Words | Definition, List & Examples

Published on September 13, 2023 by Kassiani Nikolopoulou .

A root word is the most basic form of a word that cannot be further divided into meaningful segments. Root words are used to form new words by adding letters at the beginning (i.e., a prefix) and/or the end (i.e., a suffix).

For example, the word “unfaithful” is made up of these different parts:

root words example

prefix        root word     suffix

By adding a suffix and/or a prefix to a root word like “faith,” we can make other words such as “faithful,” “faithfully,” “unfaithful,” and “unfaithfully . ” These words are linked both in terms of spelling and meaning and are called a word family .

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What are root words, example root words, latin root words (free downloadable list), greek root words (free downloadable list), worksheet: root words, frequently asked questions about root words.

A root word is the fundamental unit of a word. A root word has nothing added at the beginning or the end. While some root words are standalone words in English, others need a prefix (like “anti-” or “un-”) and/or a suffix (like “-able” or “-ist”) to create a meaningful word.

For example, “cede” is a root word for other words like “recede” or “precedent,” but it is also a word on its own (meaning “to give up”). On the other hand, the root word “struct” does not constitute an understandable word in itself and other letters need to be added for it to make sense (e.g, “instructor,” “destruction,” “structural”).

Many words are created from Latin or Greek root words and usually cannot function as standalone words in English. For example, “chrono” comes from Greek and is the root of words like “chronology,” “synchronize,” and “chronic,” but it’s not a separate word in English.

Learning about root words can help you work out the meaning of new or longer words. When you know how to decode unknown words by identifying their root words and affixes (i.e., the prefix or suffix attached to them), you can navigate more complex or specialized texts. For example, many root words derived from Latin and Greek are common in math and science terminology, like “centi” (“hundred”) or “geo” (“earth”).

  • When added at the beginning of the word, they are called prefixes . Common prefixes include: “an-” (“without”), anti- (“against”), “hyper-” (“over”), “non-” (“lack of”), “pre-” (“before”), and “post-” (“after”).
  • When added at the end of the word, they are called suffixes . Common suffixes include: “-acy” (“state or quality”), “-able/-ible” (“capable of”), “-al” (“pertaining to”), “-ic/-ical” (“having the form”), and “-less” (“without”).

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Some root words can be used independently, while others need to be combined with a prefix (i.e., letters at the beginning), a suffix (i.e., letters at the end) or another root word (e.g., -logue) to form a standalone word.

act to do react, action, activity
centr/o/i center eccentric, egocentric, centrifuge
cycl circle cycle, bicycle, encyclopedia
domin master domineering, dominate, dominant
ego I ( singular) egomaniac, egotistic, superego
employ apply/make use of unemployment, employee, disemploy
form shape uniform, formality, information
friend friend unfriendly, befriend, friendship
norm a carpenter’s square/ a pattern abnormal, enormous, normalize
note comment upon keynote, denote, connotation
place spot misplaced, displaced, workplace
use take or hold user, useless, misuse

Root words vs. base words

The terms root words and base words are often used interchangeably. However, they are not exactly the same. While root words cannot always be used as standalone words in English, base words can be used on their own or combined with other words or letters to create complex words.

For example, “code” is a base word that can be used independently or to create other words like “barcode,” “decode,” or “codify.” On the other hand, the root word “aud” (which comes from Latin) cannot be used by itself and has to be combined with other letters to form words like “auditorium,” “audition,” and “audible.” Because many root words are of Latin or Greek origin, they don’t make sense as independent words in English.

Sometimes, root words and base words overlap. For example, the word “act” is a root word of Latin origin, but also a standalone word in English. By adding a prefix or suffix, we get new words like “reaction,” “exact,” and “actor.” In this case, “act” is both a root word and a base word.

Below is a list containing common Latin root words, their meaning, and examples of words based on each root. You can also download this list in the format of your choice below.

Download PDF list Download Google Docs list

Latin root words
anim(a) breath or soul animate, animal, unanimous
aqua water aquarium, aquatic, aquamarine
aud to hear/listen audio, inaudible, audition
bene good benefactor, benefit, benign
brev short abbreviation, brevity, brief
cand/cend to glow/shine incandescent, candid, candidate
carn meat or flesh carnivorous, carnage, reincarnation
cred to believe/trust incredible, credentials, creed
dict/dic to say dictionary, diction, dedicate
doc to teach doctrine, docile, document
don to give/grant donor, condone, pardon
duce/duct to lead deduce, induction, produce
hospit host, guest hospital, inhospitable, hostess
jur/jus law/right/oath conjure, jurisdiction, justice
libr book library, libretto, librarian
luc/lum brightness/clarity elucidate, lucid, illuminate
magn great/large magnanimous, magnificent, magnifying
manu hand manuscript, manicure, manipulate
pac peace Pacific, pacifier, pacifist
port to carry export, import, reporter
scrib/script to write describe, script, nondescript
sens to feel sense, consensus, desensitize
terr earth terrain, territory, extraterrestrial
vac empty evacuate, vacancy, vacuum
vis/vid to see invisible, video, evidence

Below is a list containing common Greek root words, their meaning, and examples of words based on each root. You can also download this list in the format of your choice below.

Greek root words
aero air aerodynamic, aeronautics, aerobic
aesthet related to the senses aesthetic, anesthetic, anesthesia
anthrop human anthropology, misanthrope, philanthropist
astro/aster star astronomy, astronaut, asteroid
auto self automatic, autobiography, autofocus
biblio book bibliography, bible, bibliophile
bio life biology, biography, symbiosis
chrome color monochrome, chromosome, chromatic
chrono time chronicle, chronological, synchronize
cosm(o) world/universe cosmology, cosmopolitan, microcosm
dyn power dynamic, dynamite, electrodynamics
gnos know diagnosis, prognosticate, agnostic
graph write telegraph, calligraphy, geography
hydr water hydrogen, hydration, dehydrate
logy study epistemology, ecology, trilogy
mania frenzy mania, megalomaniac, egomania
melan black melatonin, melamin, melancholy
metr/meter measure metric, asymmetry, diameter
narc numbness/sleep narcotic, narcolepsy, narcosis
paleo old paleontology, Paleolithic, paleobotany
phon sound/voice microphone, telephone, symphony
photo light photograph, photon, photocopy
psych soul/spirit psychology, psychiatrist, psychic
rhe flow rhythm, rheology, diarrhea
schem shape/manner scheme, schematic, schemer
therm heat hypothermia, thermometer, thermostat

Base words can stand alone, but can also be combined with other letters to create new words.

act transaction
appear disappear
break unbreakable
care careful
color discolored
do undo
harm harmful
honest honestly
hope hopeless
kind kindness
like dislike
love beloved
mark unmarked
pack unpack
paint repainted
place displacement
play downplay
reason unreasonable
spell spellbound
worth worthless

Want to test your understanding of root words? Try the worksheet below. In each sentence, see if you can identify the root word(s) of the highlighted word.

  • Answers & explanation
  • The hotel lost our reservation, and the receptionist was really unhelpful .
  • We came to a unanimous decision that more staff is needed during peak hours.
  • ANOVA is an abbreviation of “Analysis of Variance”.
  • My father is agnostic when it comes to religious matters.
  • One of the three aqueducts supplying water to the Los Angeles area is from the Colorado River.
  • The root word is help . The word “unhelpful” is made of three parts: “un-” (prefix), ”help” (root word), and “ful” (suffix).
  • The root word is anim . The word “unanimous” is made of two parts: “unus” (meaning “one” in Latin) and “animus” (meaning “spirit” or “mind” in Latin).
  • The root word is brev . The word “abbreviation” comes from Latin “ad” (prefix meaning “to”) and “breviare” (“shorten”), from brevis (“short”).
  • The root word is gnost . The word “agnostic” is made of three parts: “a” (prefix meaning “not” or “without”), “gnost” (root word meaning “to know” in Greek) and “ic” (suffix).
  • This word contains two Latin root words: aqua (“water”) and duct (“to lead”).

Although there is no particular rule for finding the root of a word, one way to do this is to check if the word has any affixes (suffix and/or prefix) added to it.

For example, the word “hyperactive” has the prefix “hyper-” (meaning “over”) and the suffix “-ive” (meaning “having the nature of”). If we remove the affixes, we get the root word (“act”).

The root word “dorm” means “sleep” in Latin. So words with this root word will have a meaning related to sleep. For example, the words “dormant,” “dormitory,” and “dormouse” all come from the same root word.

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Other forms: theses

A thesis is the most important or foundational idea of an argument. If the thesis of your paper is that chocolate ice cream is better than vanilla, you'll need to back that up with plenty of sundae-based research.

The noun thesis has more than one important sense to it. One definition of thesis is that it is the most important or foundational idea of an argument, presentation, or piece of writing. But it can also mean a large work of art, criticism, or scientific research that represents original research and is generally the final requirement for an academic degree.

  • noun an unproved statement put forward as a premise in an argument see more see less type of: assumption , premise , premiss a statement that is assumed to be true and from which a conclusion can be drawn
  • noun a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree synonyms: dissertation see more see less type of: tractate , treatise a formal exposition

Vocabulary lists containing thesis

A thorough survey of various textbooks, assignments, content area standards, and examinations yields the following list of words compiled by Jim Burke . You cannot expect to succeed on assignments if you do not understand the directions.

Persuade yourself to study this list of words related to argumentative writing. You'll learn all about making claims, supporting arguments with evidence, and maintaining an objective tone. It's no fallacy that reviewing these words will improve your credibility as a writer.

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Meaning of thesis in English

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  • I wrote my thesis on literacy strategies for boys .
  • Her main thesis is that children need a lot of verbal stimulation .
  • boilerplate
  • composition
  • corresponding author
  • dissertation
  • essay question
  • peer review

You can also find related words, phrases, and synonyms in the topics:

thesis | Intermediate English

Examples of thesis, collocations with thesis.

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Translations of thesis

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what does the root word thesis mean

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Definition of thesis noun from the Oxford Advanced American Dictionary

Questions about grammar and vocabulary?

Find the answers with Practical English Usage online, your indispensable guide to problems in English.

  • formulate/advance a theory/hypothesis
  • build/construct/create/develop a simple/theoretical/mathematical model
  • develop/establish/provide/use a theoretical/conceptual framework/an algorithm
  • advance/argue/develop the thesis that…
  • explore an idea/a concept/a hypothesis
  • make a prediction/an inference
  • base a prediction/your calculations on something
  • investigate/evaluate/accept/challenge/reject a theory/hypothesis/model
  • design an experiment/a questionnaire/a study/a test
  • do research/an experiment/an analysis
  • make observations/calculations
  • take/record measurements
  • carry out/conduct/perform an experiment/a test/a longitudinal study/observations/clinical trials
  • run an experiment/a simulation/clinical trials
  • repeat an experiment/a test/an analysis
  • replicate a study/the results/the findings
  • observe/study/examine/investigate/assess a pattern/a process/a behavior
  • fund/support the research/project/study
  • seek/provide/get/secure funding for research
  • collect/gather/extract data/information
  • yield data/evidence/similar findings/the same results
  • analyze/examine the data/soil samples/a specimen
  • consider/compare/interpret the results/findings
  • fit the data/model
  • confirm/support/verify a prediction/a hypothesis/the results/the findings
  • prove a conjecture/hypothesis/theorem
  • draw/make/reach the same conclusions
  • read/review the records/literature
  • describe/report an experiment/a study
  • present/publish/summarize the results/findings
  • present/publish/read/review/cite a paper in a scientific journal

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theses
a statement or proposition put forward and supported by proof or argument. , , , , , ,
an essay or dissertation, esp. one based on research or critical study, submitted as a requirement for an advanced academic degree. , , , , , , ,
the opening of a dialectical argument or process, followed by antithesis and resolved in synthesis.
the accented part of a musical measure; downbeat. , ,
, , , , , , , , , ,
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  • thesis (noun)
  • She wrote her thesis on Renaissance Nativity scenes.
  • a master's/doctoral thesis on the effects of global warming
  • New evidence supports his thesis .
  • We disagreed with the basic thesis of the report.
  • The book's central thesis is that propaganda influences the masses in important ways.
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hypothetical

Something that is hypothetical is based on possible situations or events rather than actual ones.

The anti thes is of something is its opposite.

An epithet is a short description or term that usually follows and augments someone's name, such as the word "great" in "Alfred the Great."

parenthetical

A parenthetical remark further explains or qualifies information.

A syn thes is is the combination or blend of two or more things to form a new whole.

A thes is is a main idea for a paper that its author tries to prove by giving examples that support the idea.

antithetical

sharply contrasted in character or purpose

a proposal intended to explain certain facts or observations

hypothesize

to believe especially on uncertain or tentative grounds

parentheses

either of two punctuation marks (or) used to enclose textual material

parenthesis

Photosynthesis.

syn thes is of compounds with the aid of radiant energy (especially in plants)

combine so as to form a more complex, product

not of natural origin

a book containing a classified list of synonyms

an unproved statement put forward as a premise in an argument

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COMMENTS

  1. thesis

    thesis. (n.). late 14c., "unaccented syllable or note, a lowering of the voice in music," from Latin thesis "unaccented syllable in poetry," later (and more correctly) "stressed part of a metrical foot," from Greek thesis "a proposition," also "downbeat" (in music), originally "a setting down, a placing, an arranging; position, situation" (from reduplicated form of PIE root *dhe-"to set, put").

  2. Thesis Definition & Meaning

    The meaning of THESIS is a dissertation embodying results of original research and especially substantiating a specific view; especially : one written by a candidate for an academic degree. How to use thesis in a sentence. Did you know?

  3. thesis, n. meanings, etymology and more

    There are seven meanings listed in OED's entry for the noun thesis. See 'Meaning & use' for definitions, usage, and quotation evidence. thesis has developed meanings and uses in subjects including. prosody (Middle English) music (Middle English) rhetoric (late 1500s) logic (late 1500s) education (late 1700s) philosophy (1830s)

  4. Thesis

    The term thesis comes from the Greek word θέσις, meaning "something put forth", and refers to an intellectual proposition. Dissertation comes from the Latin dissertātiō, meaning "discussion". Aristotle was the first philosopher to define the term thesis.. A 'thesis' is a supposition of some eminent philosopher that conflicts with the general opinion...for to take notice when any ...

  5. THESIS Definition & Meaning

    Thesis definition: a proposition stated or put forward for consideration, especially one to be discussed and proved or to be maintained against objections. See examples of THESIS used in a sentence.

  6. thesis

    thesis (plural theses) ( rhetoric) A proposition or statement supported by arguments. (by extension) A lengthy essay written to establish the validity of a thesis (sense 1.1), especially one submitted in order to complete the requirements for a non- doctoral degree in the US and a doctoral degree in the UK; a dissertation .

  7. thesis noun

    thesis (that…) a statement or an opinion that is discussed in a logical way and presented with evidence in order to prove that it is true. The basic thesis of the book is fairly simple. These latest findings support the thesis that sexuality is determined by nature rather than choice.

  8. What Does Thesis Mean?

    The definition of thesis (ˈθi sɪs, ˈθiːsɪs, the-sis, plural theses) in American English is the main idea presented in an essay. In other words, the central message of the piece. Behind every literary device and rhetorical strategy stands a thesis. Thesis statements don't just appear at the beginning of your paper; they should be woven ...

  9. Thesis Definition & Meaning

    Thesis definition: A proposition that is maintained by argument. A proposition maintained or defended in argument, formerly one publicly disputed by a candidate for a degree in a medieval university.

  10. THESIS

    THESIS definition: 1. a long piece of writing on a particular subject, especially one that is done for a higher…. Learn more.

  11. Root Words

    Root words are used to form new words by adding letters at the beginning (i.e., a prefix) and/or the end (i.e., a suffix). For example, the word "unfaithful" is made up of these different parts: prefix root word suffix. By adding a suffix and/or a prefix to a root word like "faith," we can make other words such as "faithful ...

  12. THESIS definition and meaning

    7 meanings: 1. a dissertation resulting from original research, esp when submitted by a candidate for a degree or diploma 2. a.... Click for more definitions.

  13. Thesis

    thesis: 1 n an unproved statement put forward as a premise in an argument Type of: assumption , premise , premiss a statement that is assumed to be true and from which a conclusion can be drawn n a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree Synonyms: dissertation Type ...

  14. THESIS

    THESIS meaning: 1. a long piece of writing on a particular subject, especially one that is done for a higher…. Learn more.

  15. THESIS definition in American English

    thesis in American English. (ˈθisɪs) noun Word forms: plural -ses (-siz) 1. a proposition stated or put forward for consideration, esp. one to be discussed and proved or to be maintained against objections. He vigorously defended his thesis on the causes of war. 2. a subject for a composition or essay. 3.

  16. thesis noun

    Look up any word in the dictionary offline, anytime, anywhere with the Oxford Advanced Learner's Dictionary app. 2 a statement or an opinion that is discussed in a logical way and presented with evidence in order to prove that it is true She concluded that there was no archaeological data to support the thesis that the town had been ...

  17. thesis

    It's an interesting thesis, but you haven't provided enough evidence to convince me of its validity.Martin Luther put forward the thesis that one can achieve one's own salvation without the intermediary of a priest. synonyms: exposition, premise, proposition similar words: argument, hypothesis, statement, theorem, theory: definition 2:

  18. THESIS Definition & Meaning

    Thesis definition: . See examples of THESIS used in a sentence.

  19. Thesis Definition & Meaning

    1. : a long piece of writing on a particular subject that is done to earn a degree at a university. She wrote her thesis on Renaissance Nativity scenes. a master's/doctoral thesis on the effects of global warming. 2. formal : a statement that someone wants to discuss or prove. New evidence supports his thesis. We disagreed with the basic thesis ...

  20. Word Root: thes (Root)

    An epithet is a short description or term that usually follows and augments someone's name, such as the word "great" in "Alfred the Great." parenthetical. A parenthetical remark further explains or qualifies information. synthesis. A synthesis is the combination or blend of two or more things to form a new whole. thesis

  21. Syn and Thesis- Greek root words Flashcards

    Syn and Thesis- Greek root words. Syn. Click the card to flip 👆. with,together. Click the card to flip 👆.

  22. Thesis ( Greek Root Word ) Flashcards

    Thesis. A position taken in a argument supported by a set of reasons. Theme. An essay or composition on a certain subject with a statement and supporting reasons. Parenthesis. (Para - beside) - statement beside (or inside) a main sentence. Synthetic. (Syn-Together) elements put together to make a material like a natural one (synthetic rubber ...

  23. Trump calls political enemies 'vermin,' echoing dictators Hitler

    The former president's speech in Claremont, N.H., echoed his message of vengeance and grievance, as he called himself a "very proud election denier" and decried his legal entanglements, once ...