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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But nearly 30 years earlier, astronomer Percival Lowell first theorized the existence of the planet, partially based on irregularities in the orbit of Uranus. Eric Lagatta, USA Today, 30 Apr. 2026 However, no ransom was ever paid, and no proof of life was ever produced, which has left Clemente to theorize that perhaps Nancy was kidnapped to torment her family. Lizzie Lanuza, StyleCaster, 30 Apr. 2026 Wen, who is a hedge fund and cryptocurrency investor, doesn’t know who is potentially behind his father’s disappearance, but theorized to the LA Times that contractors who previously worked on his father’s home may have kidnapped him. Latoya Gayle, PEOPLE, 28 Apr. 2026 Now, one team of researchers theorizes that such cosmic titans could have come about before their time, thanks to changes made to galaxies by energy released by the decay of dark matter. Robert Lea, Space.com, 27 Apr. 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 3 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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