noun
Etymology
Origin of theorist
Explanation
Someone who considers given facts and comes up with a possible explanation is called a theorist. Theorists observe various phenomena and use reasoning to come up with practical ideas that must be proven. Theorists come up with abstract ideas and then spend their lives trying to prove them. Perhaps the most famous theorist was Albert Einstein, whose theory of relativity is arguably the most famous ever presented. Still, an idea can always be disputed until proven, and theorists are often scoffed at. Einstein himself once said, "No one but a theorist believes his theory; everyone puts faith in a laboratory result but the experimenter himself."
Vocabulary lists containing theorist
Florida's B.E.S.T. Common Suffixes: -ist
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Selection Vocabulary 3, Unit 1
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A U.S. naval officer, historian, and military theorist, Mahan argued that control of the seas was the key to empires from Rome to Britain.
From Barron's • Jun. 5, 2026
Australian police have arrested two men in connection with Dezi Freeman, the conspiracy theorist gunman who was shot dead by police after a seven-month manhunt in March.
From BBC • May 26, 2026
A federal district judge on Friday rejected conspiracy theorist Alex Jones’s bid to shield Infowars from liquidation, upholding a bankruptcy court ruling that the assets aren’t protected by his personal bankruptcy estate.
From The Wall Street Journal • May 18, 2026
Do you ever get the sense that your Twitter algorithm thinks that you, yourself, are a conspiracy theorist?
From Slate • May 7, 2026
From his own experiences in Vietnam and his reading of the German military theorist Carl von Clausewitz, Van Riper became convinced that war was inherently unpredictable and messy and nonlinear.
From "Blink" by Malcolm Gladwell
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
