theorize

verb

the·​o·​rize ˈthē-ə-ˌrīz 

ˈthir-ˌīz

theorized; theorizing

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 

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

Scientists have always theorized that gravity was the main sculptor during this early era. — Robert Lea, Space.com, 4 Sep. 2026

While it was theorized that a similar wave may be present over the south pole, the decagon seems to have formed more recently. — Adam Kovac, Scientific American, 2 Sep. 2026

The shoes were too different compared to the originals and thus were all but ignored by everyday casual shoppers — another demographic who Chase theorizes would accept the Protro updates. — Riley Jones, Footwear News, 1 Sep. 2026

Slower drivers, urban planners theorize, can encourage economic growth in addition to keeping streets safer. — Fort Worth Star-Telegram, 28 Aug. 2026

Word History

First Known Use

1644, in the meaning defined at transitive sense 1

Rhymes for theorize

• advise
• applies
• apprise
• arise
• assize
• baptize
• belies
• bitwise
• capsize
• chastise
• chordwise
• clockwise

Kids Definition

theorize

verb

the·​o·​rize ˈthē-ə-ˌrīz 

theorized; theorizing

: to form a theory : speculate

theorizer noun