nounless common
a person who develops or studies general ideas that explain how something works, especially in a particular subject
She is a leading political theorist.
Freud is often described as an influential theorist.
Good to know
Theorist is a person. For the adjective, use theoretical: a theoretical model.
Common phrases & grammar
political theorist · social theorist · literary theorist · leading theorist
a theorist in + field
a theorist who + verb