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:
It didn’t find a full solution, but it made a related finding that one Stanford number theorist called “the most impressive result that AI has produced in math so far.”
From The Wall Street Journal ● Aug. 15, 2026
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
The Onion is seeking a license to operate Infowars as a parody site while right-wing conspiracy theorist Alex Jones’ company faces liquidation for owing Sandy Hook families over $1 billion in defamation damages.
From Los Angeles Times ● Jul. 14, 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
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
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 essence of many bad decisions, decision theorists have long shown us, is privileging a single outcome or scenario as if it’s the only possible one.
From The Wall Street Journal ● Jun. 15, 2026
There were still, out there, handfuls of committed Pearl Harbor theorists.
From "Native Speaker" by Chang-rae Lee
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.
