Dictionary entry

ἀποστασία

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

ἀποστασία, -ας, ἡ

(< ἀφίστημι), [in LXX for מַעַל, etc.;]

defection, apostasy, revolt; in late Gk. (MM, Exp., viii; Lft., Notes, 111; Cremer, 308) for cl. ἀπόστασις, freq. in sense of political revolt, in LXX (e.g. Jos 22:22, II Ch 29:19, Je 2:19) and NT always of religious apostasy: Ac 21:21, II Th 2:3.†