Plural of apostacy; plural form of the act of abandoning one's religious faith, political beliefs, or principles.
From 'apostacy,' which derives from Greek 'apostasia' (a standing away from, defection). The plural adds the standard English '-ies' suffix to indicate multiple instances.
History is full of apostacies—people dramatically switching sides—and they often changed the world: people leaving religious orders started the Reformation, and political defectors won the Cold War.
Complete word intelligence in one call. Free tier — 50 lookups/day.