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From Latin apostasia, from Ancient Greek ἀποστασία (apostasía, defection, revolt), from ἀφίστημι (aphístēmi, I withdraw, revolt), from ἀπό (apó, from) + ἵστημι (hístēmi, I stand)



apostasy (countable and uncountable, plural apostasies)

  1. The renunciation of a belief or set of beliefs.
    Synonyms: backsliding, conversion, deconversion
    • 1871, James Anthony Froude, History of England from the Fall of Wolsey to the Death of Elizabeth, page 394:
      The King of Navarre suddenly abandoned his party and went over to the Catholics. The explanation of his apostasy was as simple as it was base: Navarre had no confidence in the success of his cause, and he cared little in his heart for anything but women and vanity.
    • 1886, Henry James, The Princess Casamassima:
      What had he said, what had he done, after all, to give them the right to fasten on him the charge of apostasy? He had always been a free critic of everything, and it was natural that, on certain occasions, in the little parlour in Lisson Grove, he should have spoken in accordance with that freedom; but it was only with the Princess that he had permitted himself really to rail at the democracy and given the full measure of his scepticism.
  2. Specifically, the renunciation of one's religion or faith.
    Synonyms: defection, disaffection, estrangement

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