Quick Definition
ἀποστασία, ας, ἡ n.f. defection, apostasy
Strong's Definition
feminine of the same as 647; defection from truth (properly, the state) ("apostasy")
KJV Usage: falling away, forsake
UBS Dictionary of the Greek New Testament
noun, f. | -ας | ἵστημι
39.34 · Hostility, Strife · Rebellion
to rebel against, to revolt, to engage in insurrection, rebellion to rise up in open defiance of authority, with the presumed intention to overthrow it or to act in complete opposition to its demands It is also possible that ἀποστασία differs slightly in meaning from ἐπίστασις[b] by virtue of the differences in prefixal formation, but there is insufficient contextual evidence to support such a view.
1 It is possible that ἐπανίστημι and ἐπίστασις[b], with the prefix ἐπι, differ in some measure from ἀνίστημι[h] and στάσις[a] by virtue of the prefixal element which may suggest action directed specifically toward some object, but there is insufficient contextual evidence to support such distinct meanings.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἀποστασία, -as, 7, (ἀφίσταμαι), a falling away, defection, apostasy; in the Bible sc. from the true religion: Acts xxi. 21; 2 Th. ii. 3; ([Josh. xxii. 22; 2 Chr. xxix. 19; xxxiii. 19]; Jer. ii. 19 ; xxxvi. (xxix.) 32 Compl. ; 1 Mace. ii. 15). The earlier Greeks say ἀπόστασις ; see Lob. ad Phryn. p. 528; [W. 24].
Mounce Concise Greek Dictionary
ἀποστασία apostasia 2x
a falling away, a rebellion, apostasy, Acts 21:21; 2 Thess. 2:3*
Abbott-Smith Greek Lexicon
† 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.†
Moulton & Milligan — Vocabulary of the Greek NT
ἀποστασία. The noun ἀποστάτης (cf. LXX Dan 3%) occurs in P Revill Mél (B.c. 130) (= Witkowski,? p. 96) χρήσασθαι δ᾽ αὐτοῖς ὡς ἀποστάταις (sc. Tots ἐν “Εἱρμώνθει ὄχλοις), whom a certain Paon μετὰ δυνατῶν ἱκανῶν is sailing up the Nile to reduce (καταστῆσαι). So in Sy// 930% (B.C. 112) τινες τῶν ἐγ Βοιωτίας ἀποστάται] γεγενημένοι. In P Amh II. 320 (ii/B.c.) we read of the burning of title-deeds by Egyptian ‘“‘rebels,” ἠναγκάσθην ὑπὸ τῶν Αἰγυπτίων ἀποστατῶν ἐνέγκαι τὰς συνγραφὰς καὶ ταύτας κατακαῦσαι. The old word ἀπόστασις, equivalent to -σία (cf. 1 Macc 2}, Ac 213}, and see Nageli, p. 31), occurs in P Par 3615 (ii/B c.), where a temple recluse petitions the strategus against the conduct of certain persons who had forced their way into ’ ἀποστάσιον 69 the temple, βουλόμενοι ἐξσπάσαι pe kal ἀγαγῆσαι, καθάπερ kal ἐν τοῖς πρότερον χρόνοις ἐπεχείρησαν, οὔσης ἀποστάσεως. For the adj. ἀποστατικός, see P Tor 8 (8.6. 119) ἀποστατικῶι τρόπωι. In the same line αὐτοκρασίαι occurs, an illustration of the Hellenistic tendency to form new nouns in -σία: see Lobeck, Paverxga. p. 528 f.
Liddell-Scott-Jones — Greek-English Lexicon
ἀποστασία (apostasia) — apostasy. ἀπο-στᾰσία, ἡ, late form for ἀπόστασις, defection, revolt, variant in [Refs 1st c.BC+]; especially in religious sense, rebellion against God, apostasy, [LXX+NT]
2. departure, disappearance, [Refs 6th c.AD+]
3. distinguishing, with genitive, [Refs 6th c.AD+]
4. distance, [Refs 3rd c.BC+]