Lexical Definition

‎ἐάν‎ eán (eh-an') if G:COND
from ‎εἰ‎ and ‎ἄν‎

before, but, except, (and) if, (if) so, (what-, whither-)soever, though, when (-soever), whether (or), to whom, (who-)so(-ever).

Usage: 10 forms in 1330 verses

Abbott-Smith

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;
1. c. subjc. (cl.);
(a) pres.: Mt 6:22, Lk 10:6, Jo 7:17, Ro 2:25, 26 al.;
(b) 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).
2. 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);
(a) fut.: Mt 18:19 T, Lk 19:40, Ac 7:7;
(b) pres.: I Th 3:8 (v. Milligan, in l.).
3. 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.
4. = 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.

Abbott-Smith References

Book Refs
Esther 19:13
Matthew 4:9 · 5:19 · 6:15 · 6:22 · 8:19 · 10:13 · 16:26 · 18:19
Mark 3:24 · 3:27 · 6:22 · 6:23
Luke 9:25 · 10:6 · 14:34 · 17:32 · 19:40
John 3:3 · 5:43 · 7:17 · 9:22 · 11:57 · 12:32 · 13:17 · 14:3
Acts 7:7 · 9:2
Romans 2:25 · 2:26 · 7:2 · 10:15 · 14:8
1 Corinthians 6:18 · 7:36 · 8:8 · 16:6
2 Corinthians 8:12
Galatians 1:8 · 2:16 · 5:10 · 6:1
1 Thessalonians 3:8
Hebrews 3:7
James 2:17
1 John 2:28 · 3:2 · 3:21
Revelation 11:6

Liddell-Scott-Jones

ἐάν

(so early Attic Inscrr., as [Refs 4th c.BC+], also contraction ἤν and ἄν, see at {ἤν},{ἄν} (B) [], which by crasis with καί become κἄν:—if haply, if, regularly followed by subjunctive: for its use and for examples, see at {εἰ} [Refs 5th c.BC+]

__II in Hellenistic and late Greek, ={ἄν} after relative Pronouns and Conjunctions, as ὃς ἐάν whosoever, [ἐάν “PPetr.” 3p.120 (3rd c.BC), NT.Matt.18.18; ὅστις ἐάν 1st c.AD: Philo Judaeus 1.220, 2nd c.AD: Marcus Antoninus Imperator 9.23; ὅπου ἐάν NT.Matt.8.19, etc.; ὅθεν ἐάν “Geoponica” 1.3.3: followed by \_indicative\_, LXX.1Kgs.2.14. [The second syllable of ἐάν is long, 5th c.BC: Sophocles Tragicus “Oedipus Coloneus” 1407, 5th-6th c.BC: Aristophanes Comicus “Vespae” 228, 4th c.BC: Sopater Comicus 6.9.] ">LXX+5th c.BC+]

LSJ Scripture Refs: LXX.Gen.15.14Matt.5.19Matt.18.18Matt.8.19LXX.1Kgs.2.14