A theologian who believes that the prophecies of the Apocalypse have already been fulfilled

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Preterist \Pret"er*ist\, n. [Pref. preter- + -ist.] One whose chief interest is in the past; one who regards the past with most pleasure or favor. (Theol.) One who believes the prophecies of the Apocalypse to have been already fulfilled. --Farrar.

Wiktionary Word definitions in Wiktionary
n. 1 One whose chief interest is in the past. 2 (context theology English) An adherent of preterism; one who believes that the Biblical prophecies of the Apocalypse refer to historical events which have already taken place.

WordNet Word definitions in WordNet
n. a theologian who believes that the Scripture prophecies of the Apocalypse (as in the Book of Revelations) have already been fulfilled

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"one who favors the past," 1864 (as a theological term from 1843, "one who holds that the Apocalyptic prophecies have begun to be fulfilled"), from preter- + -ist .