Lexical Definition

‎ὅταν‎ hótan (hot'-an) when(-ever) ^G:CONJ
from ‎ὅτε‎ and ‎ἄν‎

as long (soon) as, that, + till, when(-soever), while.

• whenever (implying hypothesis or more or less uncertainty)
• also causatively (conjunctionally) inasmuch as

Abbott-Smith

ὅταν (for ὅτ’ ἄν = ὅτε ἄν), temporal particle, with a conditional sense, usually of things expected to occur in an indefinite future;
1. prop., whenever;
(a) c. subjc. praes.: Mt 6:2, 5, Mk 14:7, Lk 11:36, Jo 7:27, Ac 23:35, I Co 3:4, al.; ἕως τ. ἡμέρας ἐκείνης, ὅ., Mt 26:29, Mk 14:25; seq. τότε, I Th 5:3;
(b) c. subjc. aor. (M, Pr., 185): Mt 5:11, Mk 4:15, Lk 6:22, Jo 2:10 8:28 (Field, Notes, 94), 10:4, al.
2. As in Hom. (LS, s.v.), but not in cl. prose, c. indic., when (M, Pr., 167 f.; Bl., § 65, 9): c. impf., Mk 3:11(cf. Ge 38:9, al.); c. praes., Mk 11:25; c. fut., Re 4:9 (Swete, in l.); c. aor., Mk 11:19, Re 8:1 (Swete, in ll.; M, Pr., 168, 248; Field, Notes, 35).

Abbott-Smith References

Liddell-Scott-Jones

ὅταν,

for ὅτ᾽ ἄν (ὅτε ἄν) as sometimes in codices: adverb of Time,

__A whenever, with a conditional force, so as nearly to ={ἐάν} (see. εἰ [Refs 5th c.BC+], referring to an indefinite future [Refs 8th c.BC+]; also of events like ly to recur,[Refs]: also in Epic dialect ὅτε κεν [Refs 8th c.BC+]: repeated for rhetorical effect, ὅ. ὡς ὑβρίζων, ὅ. ὡς ἐχθρὸς ὑπάρχων, ὅ. κονδύλοις, ὅ. ἐπὶ κόρρης [Refs 4th c.BC+]
__A.b later causal, since, ὅταν.. ᾖ since it is, [Refs 4th c.BC+]; in earlier examples the application to the particular case is less directly expressed, καὶ τοῦτο τυφλὸν ὅταν ἐγὼ βλέπω βραχύ this too (i.e. my staff) is blind when I am (= when its owner is) short-sighted, [Refs 5th c.BC+]
__A.2 never with indicative in early authors, except in [ὅταν.. σκαίρουσι (assuming variant); in 24.88, ὅτε κεν.. ζώννυνταί τε νέοι καὶ ἐπεντύνονται ἄεθλα">Refs 8th c.BC+]; and in [Refs 8th c.BC+]: but frequently in LXX with imperfect indicative, as ὅταν εἰσήρχετο [LXX+2nd c.BC+]: also with aorist indicative, [LXX+NT]: with future indicative, ὅταν ἕξουσι [Refs 2nd c.AD+]; ὅταν ὄψεσθε (variant{ὄψησθε}) [NT]: with present indicative, ὅταν δείκνυται [ὅταν supersedes ὅτε in Hellenistic Greek. ">Refs 1st c.BC+]
__A.3 never with optative in early authors, except in indirect speech, where in orat. recta the subjunctive with ὅταν would have stood, as perhaps [Refs 4th c.BC+]; ὅτε κεν followed by ἵκοι, [Refs 8th c.BC+]
__A.II Special usages:
__A.II.1 to introduce a simile,[Refs 8th c.BC+]
__A.II.2 πρίν γ᾽ ὅ., ={πρίν γε ἢ ὅ}. (see. ὅτε [Refs 4th c.BC+]
__A.II.3 εἰς ὅτε κεν until such time as.., [Refs]
__A.II.4 ὅ. τάχιστα, Latin cum primum, [Refs 5th c.BC+]

_{LSJ Scripture Refs: LXX.Gen.38.9 ☩ Mark.3.11 ☩ LXX.Exod.16.3 ☩ Rev.8.1 ☩ Luke.13.28}