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
Selection Vocabulary 3, Unit 1
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Florida's B.E.S.T. Common Suffixes: -ist
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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.
It’s the classic mindset of the conspiracy theorist: The absence of proof of the conspiracy is simply proof of how deep the conspiracy goes!
From MarketWatch • Apr. 3, 2026
Among the names read out was Prof Peter Higgs, the British theorist who, nearly half a century earlier, had predicted the existence of a particle believed to hold the cosmos together – the Higgs boson.
From BBC • Mar. 17, 2026
Take Roger Schank, an AI researcher and theorist who died in 2023.
From Salon • Feb. 24, 2026
The pioneering military theorist Carl von Clausewitz categorized relations in a country as military, societal and political, each having its distinct relationships with the other two.
From The Wall Street Journal • Feb. 1, 2026
Starting the year after Lawrence met him, his renown as a theorist would land him appointments first at the University of Chicago and then at Yale University’s Sloane Physics Laboratory as director.
From "Big Science" by Michael Hiltzik
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.
