theorize

verb

the·​o·​rize ˈthē-ə-ˌrīz How to pronounce theorize (audio)
ˈthir-ˌīz
theorized; theorizing
Synonyms of theorizenext

intransitive verb

: to form a theory : speculate

transitive verb

1
: to form a theory about
2
: to propose as a theory
theorization
ˌthē-ə-rə-ˈzā-shən How to pronounce theorize (audio)
ˌthir-ə-
noun
theorizer noun

Examples of theorize in a Sentence

Many scientists have theorized about the possibility of life on other planets.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
When looking at the statewide decline, state education leaders theorize it could be tied to the decline in the birth rate. — Lina Ruiz, Fort Worth Star-Telegram, 30 July 2026 Many researchers theorize that carbon can remain trapped underground for extended periods of time. — Andrew Paul, Popular Science, 29 July 2026 Physicists had long theorized that an invisible field of energy gives mass to particles like protons while leaving particles of light — photons — massless. — Lisa Song, CNN Money, 28 July 2026 The Clase-Ortiz situation, however, could be just as useful a teaching tool as any, some players theorized. — Zack Meisel, New York Times, 28 July 2026 See All Example Sentences for theorize

Word History

First Known Use

1644, in the meaning defined at transitive sense 1

Time Traveler
The first known use of theorize was in 1644

Rhymes for theorize

See All Rhymes for theorize

Browse Nearby Words

theorization
theorize
theorizer
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Cite this Entry

“Theorize.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/theorize. Accessed 5 Aug. 2026.

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Kids Definition

theorize

verb
the·​o·​rize ˈthē-ə-ˌrīz How to pronounce theorize (audio)
theorized; theorizing
: to form a theory : speculate
theorizer noun

More from Merriam-Webster on theorize

Thesaurus: All synonyms and antonyms for theorize

Nglish: Translation of theorize for Spanish Speakers

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