Definition of apostate noun from the Oxford Advanced Learner's Dictionary

 

apostate

 noun
noun
BrE BrE//əˈpɒsteɪt//
 
; NAmE NAmE//əˈpɑːsteɪt//
 
(formal)
 
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a person who has rejected their religious or political beliefs Word Origin Middle English: from ecclesiastical Latin apostata, from Greek apostatēs ‘apostate, runaway slave’.
See the Oxford Advanced American Dictionary entry: apostate