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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Astronomers theorize that 2003 EH1, which takes about 5 ½ years to orbit the sun, is a dead comet that is now essentially a rock. Eric Lagatta, USA Today, 2 Jan. 2026 Fittingly, more than a few observers have been eager to turn art into blood sport, pitting Coen against Coen, Safdie against Safdie, and theorizing about which sibling is the greater talent. Justin Chang, New Yorker, 2 Jan. 2026 The researchers theorize that this kind of intense morning song may help birds warm up their vocals more quickly following a night of rest, which in turn improves their chances of reproductive success during the day. Michele Laufik, Martha Stewart, 31 Dec. 2025 The primary objective of the experiment is to identify axions, which are hypothetical light particles theorized to exist since the early stages of the universe. Aman Tripathi, Interesting Engineering, 31 Dec. 2025 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 8 Jan. 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

More from Merriam-Webster on theorize

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