Definition of "apostate" in English

adjective

1. Guilty of apostasy.

   • We must punish this apostate priest.

noun

1. (countable, religion) A person who has renounced a religion or faith.

2. (Roman Catholicism) One who, after having received sacred orders, renounces his clerical profession.

3. (by extension) One who has renounced a political party, a cause, etc.