the·​o·​rize | \ˈthē-ə-ˌrīz, ˈthir-ˌīz\
theorized; theorizing

Definition of theorize 

transitive verb

1 : to form a theory about

2 : to propose as a theory

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Other Words from theorize

theorization \ˌthē-​ə-​rə-​ˈzā-​shən, 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

The Daily Mail theorizes the funeral being filmed might be Winston Churchill's, as the former prime minister passed away in January of 1965. Temi Adebowale, Harper's BAZAAR, "How the First Images From the Set of The Crown Mimic Real-Life Royal History," 18 Sep. 2018 There's no official word on a release date or confirmation or the products from Apple, but it's been theorized that the newest iPhone could be out this fall. Lauren Rearick, Teen Vogue, "iPhone X Rumors: Cheaper Phone Without Certain Features on the Way," 25 June 2018 Wynne theorized the sweet spot — the age at which people deem puppies oh-so-adorable — would be right around weaning. Karin Brulliard, Washington Post, "Puppies’ cuteness peaks right when they need humans most, study finds," 19 May 2018 Task force investigators working the case had theorized that the culprit might dump his next victim near water and had staked out several possible locations. Jeff Truesdell,, "New Podcast Asks: Did Cops Investigating Atlanta Child Murders Get the Right Guy?," 5 Jan. 2018 It was first theorized in the 1930s when astronomers realized that galaxies could not have the necessary gravity to retain their structures from just their visible matter—stars and planets and dust. Jay Bennett, Popular Mechanics, "Physicists Are Building a Dark Matter Experiment in an Abandoned Gold Mine," 9 Mar. 2017 Art historians theorize that the Van Campens, thinking their family was complete, commissioned the painting at some celebratory moment, but later were compelled to add their new child. Judith H. Dobrzynski, WSJ, "‘Frans Hals Portraits: A Family Reunion’ Review: Piecing Together the Van Campen Clan," 20 Oct. 2018 While not proving a causal link, the authors theorize that more diverse teams attract better talent, deepen consumer insights, strengthen employee satisfaction and make better decisions. Alexia Elejalde-ruiz,, "More women are landing seats on Illinois' corporate boards, but pace of change is 'glacial'," 24 May 2018 Moreover, the particular sterile neutrino that could hypothetically fit MiniBooNE’s data doesn’t solve any of the mysteries that led physicists to theorize about such particles in the first place. Natalie Wolchover, Washington Post, "Evidence for a new fundamental particle thrills and baffles physicists," 18 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'theorize.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of theorize

1638, in the meaning defined at intransitive sense

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Statistics for theorize

Last Updated

28 Nov 2018

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Time Traveler for theorize

The first known use of theorize was in 1638

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English Language Learners Definition of theorize

: to think of or suggest ideas about what is possibly true or real : to form or suggest a theory about something

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More from Merriam-Webster on theorize

Rhyming Dictionary: Words that rhyme with theorize

Spanish Central: Translation of theorize

Nglish: Translation of theorize for Spanish Speakers

Britannica English: Translation of theorize for Arabic Speakers

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