Etymology
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apostatize (v.)

"abandon one.s faith, principles, or church," 1610s, from Late Latin apostatizare, earlier apostatare, from apostata "one who forsakes his religion or faith" (see apostate (n.)). Related: Apostatized; apostatizing. The past participle form apostazied is attested from late 14c.

updated on January 29, 2017

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Definitions of apostatize from WordNet

apostatize (v.)
abandon one's beliefs or allegiances;
From wordnet.princeton.edu, not affiliated with etymonline.