(an′ti·krīst′) noun
Any opponent or enemy of Christ, whether a person or a power; specifically, a great enthroned antagonist, foretold in the Scriptures, who, as some have understood, is to precede the second coming of Christ: by some considered as evil personified. See I John ii 18.

(an′ti·krīst′) noun
1. A false claimant of the attributes and characteristics of Christ.
2. A denier or opponent of Christ or Christianity.
—an·ti·chris·tian (an′ti·kris′chən) adjective