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
And he took an interest in Jones, the conspiracy theorist and radio and internet host.
From Los Angeles Times • May 21, 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
But it seems to think I’m a conspiracy theorist who is also interested in whatever the media drama of the day is.
From Slate • May 7, 2026
Cicero was the great eminence of the Roman age—a lawyer, a politician, and so not only Rome’s greatest theorist of rhetoric but its greatest practitioner.
From "Words Like Loaded Pistols" by Sam Leith
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.
