Etymology
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apostate (n.)

mid-14c., "one who forsakes his religion or faith," from Old French apostat and directly from Late Latin apostata (which form also was used in English), from Greek apostasia, apostasis "defection, desertion, rebellion," from apostanai "to defect," literally "to stand off," from apo "off, away from" (see apo-) + stanai, aorist of histanai "to set, place," literally "cause to stand," from PIE root *sta- "to stand, make or be firm."

Used from mid-14c. in non-religious situations, "one who has forsaken the party, opinion, etc., to which he previously adhered."

apostate (adj.)

"unfaithful to a religious creed or to a principle," late 14c., see apostate (n.).

updated on April 18, 2017

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Definitions of apostate from WordNet
1
apostate (n.)
a disloyal person who betrays or deserts his cause or religion or political party or friend etc.;
Synonyms: deserter / renegade / turncoat / recreant / ratter
2
apostate (adj.)
not faithful to religion or party or cause;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.