THEORIST Meaning of THEORIST in English theorist BrE AmE ˈθɪər ɪst § ˈθiː ə r-, § -əst AmE \ ˈθiː ə r əst ˈθɪr əst ▷ theorist|s s Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012