Abbott-Smith Manual Greek Lexicon
ἐάν (G1437)
334 ἐάν , contr. fr. εἰ ἄν , conditional particle , representing something as "under certain circumstances actual or liable to happen," but not so definitely expected as in the case of εἰ c. ind. (Bl., §65, 4; cf. Jo 13:17 , I Co 7:36 ), if haply, if ; c. subjc. (cl.); pres.: Mt 6:22 , Lk 10:6 , Jo 7:17 , Ro 2:25 , 26 al.; aor. (= Lat. fut. pf.): Mt 4:9 16:26 (cf. ptcp. in Lk 9:25 ; M, Pr. , 230), Mk 3:24 , Lk 14:34 , Jo 5:43 , Ro 7:2 , al.; = cl. εἰ , c. opt., Jo 9:22 11:57 , Ac 9:2 ; as Heb. אִם = ὅταν , Jo 12:32 14:3 , I Jo 2:28 3:2 , He 3:7 (LXX) . C. indic, (as in late writers, fr. Arist. on; v. WH, App. , 171; VD, MGr. 2, App. , §77; Deiss., BS , 201f., LAE , 155, 254; M, Pr. , 168, 187; Bl., §65, 4); fut.: Mt 18:19 T, Lk 19:40 , Ac 7:7 ; pres.: I Th 3:8 (v. Milligan, in l.). With other particles: ἐ. καί (Bl., §65, 6), Ga 6:1 ; ἐ. μή (M, Pr. , 185, 187; Bl., l.c.), c. subjc. pres., Mt 10:13 , I Co 8:8 , Ja 2:17 , I Jo 3:21 ; aor., Mt 6:15 , Mk 3:27 , Jo 3:3 , Ro 10:15 , Ga 1:8 2:16 (v. Lft., Ellic., in ll.); ἐ. τε . . . ἐ. τε , [in LXX for אִם . . . אִם , Es 19:13 , al.,] Ro 14:8 . = cl. ἄν (q.v.) after relat. pronouns and adverbs (Tdf., Pr. , 96; WH, App. , 173; M, Pr. , 42f.; Bl., §26, 4; Mayser, 152f.; Deiss., BS , 202ff.): ὃς ἐ. , Mt 5:19 , Mk 6:22 , 23 Lk 17:32 , I Co 6:18 , al.; ὅπου ἐ. , Mt 8:19 ; ὁσάκις ἐ. , Re 11:6 ; οὗ ἐ. , I Co 16:6 ; καθὸ ἐ. , II Co 8:12 ; ὅστις ἐ. , Ga 5:10 .
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain