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“apostasy” in Latin

The English word apostasy itself goes back to Latin ăpostăsĭa.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

apostasy
*defectio a sacris: defectio (apostasia, Salvianus, de Gubern. Dei).

Quick answer

What is the Latin word for apostasy?
The usual Latin words for “apostasy” are dēfectiō, ăpostăsĭa, Salvĭānus; also deus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.