noun
Other Word Forms
Noun Inflected Forms
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.
See Examples For:
After an initial experiment with inconclusive results, he asked me, as a quantum theorist, for help in working out what to expect.
From Science Daily ● Aug. 4, 2026
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
At times, he gives off the air of a professor, donning blue blazers and short-sleeved button-down shirts as he quotes the political theorist Hannah Arendt.
From The Wall Street Journal ● May 19, 2026
He was a theorist, and this was a job that called for experimenters and engineers.
From "Outliers" by Malcolm Gladwell
For nearly three decades, a onetime Compton gang leader named Duane “Keffe D” Davis has been one of the most vocal theorists about one of the most debated celebrity killings ever.
From Los Angeles Times ● Aug. 12, 2026
The belief, which air theorists had propagated since the onset of combat planes in World War I, seemed confirmed by the results of World War II. However, the U.S.
From Slate ● Jul. 30, 2026
But both sides have strongly denied this was a repeat of the 'Disgrace of Gijon' - even though conspiracy theorists argue the nature of the chaotic finish, which included two injury-time goals, felt scripted.
From BBC ● Jun. 28, 2026
The team is now working with theorists to better understand exactly how "quantum" these newly created states are.
From Science Daily ● Jun. 15, 2026
By the time the controversy ended, six physicists had departed the lab, including all four of its theorists.
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.
