theoretician

American  

[thee-er-i-tish-uhn, theer-i-] / ˌθi ər ɪˈtɪʃ ən, ˌθɪər ɪ- /

noun

1. a person who deals with or is expert in the theoretical side of a subject.

   a military theoretician.

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theoretician British  

/ ˌθɪərɪˈtɪʃən /

noun

1. a student or user of the theory rather than the practical aspects of a subject

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Etymology

Origin of theoretician

First recorded in 1885–90; theoretic(s) + -ian

Example Sentences

He was influenced by Sayyid Qutb, the Sunni Egyptian theoretician of the Muslim Brotherhood who propagated the idea of an Islamic Republic.

From The Wall Street Journal • Mar. 1, 2026

The first important detail that the film gets right is that Oppenheimer, for all of his undeniable brilliance as a theoretician, is ultimately best remembered for practical achievements rather than intellectual ones.

From Salon • Jul. 22, 2023

Alan holds out hope because he’s a theoretician, and they like to believe weird stuff.

From Scientific American • Jun. 7, 2023

“That is the point with Davis: more theoretician than historian, more instinct than research,” wrote the late journalist and L.A.

From Los Angeles Times • Oct. 25, 2022

Moreover, he took a firm stand against the holdouts, as in the case of Gian-Carlo Wick, an outstanding Rad Lab theoretician.

From "Big Science" by Michael Hiltzik