Lexical Definition

‎μεσονύκτιον‎ mesonýktion (mes-on-ook'-tee-on) midnight ^G:N-N
neuter of compound of ‎μέσος‎ and ‎νύξ‎

midnight.

• midnight (especially as a watch)

Abbott-Smith

μεσο-νύκτιος (on v.l. μεσα-, v. Bl., § 6, 2), -ον, (< μέσος, νύξ), [in LXX chiefly for הַלַּיְלָה חֵצִי;]
of or at midnight; as subst., neut., τὸ μ., midnight (Arist. and late writers): gen., Lk 11:5; μέχρι μ., Ac 20:7; κατὰ τὸ μ., Ac 16:25; acc. (Rec., gen.; v. Bl., § 34, 8), Mk 13:35.†

Abbott-Smith References

Liddell-Scott-Jones

μεσονύκτιος-νύκτιος, ον,

of or at midnight, ἔκλειψις [μεσονύκτιοςνύκτιον δέξασθαί τινα 5th c.BC: Pindarus Lyricus ">Refs 5th c.BC+]l.7(6).5; μ. ὠλλύμαν [Refs 5th c.BC+]: neuter as adverb, [Refs 3rd c.BC+]: as substantive μεσονύκτιος-νύκτιον, τό, [μεσονύκτιοςνυκτίου ">NT+5th c.BC+]at midnight, [NT]; μεσονύκτιοςνύκτου seems to be falsa lectio in [Refs 4th c.BC+]:—the spelling μεσᾰνύκτιον is variant in [NT+3rd c.AD+]

_{LSJ Scripture Refs: LXX.Judg.16.3 ☩ Acts.16.25 ☩ Mark.13.35 ☩ Mark.13.35}