theorize

verb

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

transitive verb

1
: to form a theory about
2
: to propose as a theory
theorization 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
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Sabres coach Lindy Ruff theorized that there were more distractions at home and possibly more nerves trying to give the home crowd its money’s worth. Matthew Fairburn, New York Times, 7 May 2026 One study has theorized that more of the by-the-wind sailors may appear after particularly warm winters. Dinah Voyles Pulver, USA Today, 7 May 2026 At the heart of this massive excavation in Laufenburg is a redox flow battery, a concept first theorized in 1879. Mrigakshi Dixit, Interesting Engineering, 4 May 2026 The discovery led scientists to theorize the two species mated and triggered years of debate. Jenny Staletovich, Miami Herald, 2 May 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

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Cite this Entry

“Theorize.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/theorize. Accessed 12 May. 2026.

Kids Definition

theorize

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

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