Abbott-Smith Manual Greek Lexicon
ἄρα (G686)
158 ἄρα , illative particle , expressing a more subjective or informal inference than οὖν , then : prop. (as in cl.), the second word in the sentence, Ro 7:21 8:1 , Ga 3:7 ; ἐπεὶ ἄρα , I Co 7:14 (with another word between) 5:10 ; as the first word, Lk 11:48 , Ac 11:18 , Ro 10:17 , I Co 15:18 , II Co 5:15 7:12 , He 4:9 ; so prop. in apodosis after protasis with εἰ , Mt 12:28 , Lk 11:20 , Ga 2:21 3:29 5:11 , He 12:8 ( κενὸν ἄρα ), I Co 15:14 ; often in interrogations, direct and indirect, τίς ( τί ) ἄρα , Mt 18:1 19:25 , 27 24:45 , Mk 4:41 , Lk 1:66 8:25 12:42 22:23 , Ac 12:18 ; εἰ ἄρα , Mk 11:13 , Ac 8:22 ; εἴπερ ἄρα , I Co 15:15 ; οὐκ ἄρα , Ac 21:38 ; μήτι ἄρα , II Co 1:17 ; in strengthened forms, ἄρα γε , ἄραγε , Mt 7:20 17:26 , Ac 17:27 , and more freq. ἄρα οὖν (Epp. Paul.), so then , Ro 5:18 7:3 , 25 8:12 9:16 , 18 14:12 , 19 , Ga 6:10 , Eph 2:19 , I Th 5:6 , II Th 2:15 (Bl., § 77, 2; 78, 5; MM, s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain