Lexical Definition

‎ἐξαίφνης‎ exaíphnēs (ex-ah'-eef-nace) suddenly G:ADV
from ‎ἐκ‎ and the base of ‎αἰφνίδιος‎

suddenly.

Usage: 2 forms in 13 verses
Form Translated As     In Verse(s)
ἐξαίφνησ suddenly Mark.13.36Luke.2.13Luke.9.39Acts.9.3Acts.22.6
εξαίφνησ For suddenly LXX.Prov.24.22
Suddenly LXX.Job.1.19LXX.Isa.47.9LXX.Isa.47.9LXX.Jer.6.26LXX.Hab.2.7
shall suddenly LXX.Mal.3.1
sudden LXX.Jer.15.8

Abbott-Smith

ἐξ-αίφνης (WH, ἐξέφνης, exc. Ac 22:6; v. App., p. 151, and cf. M, Pr., 35), adv. (< ἄφνω), [in LXX chiefly for פִתְאׄם ;]
suddenly Mk 13:36, Lk 2:13 9:39, Ac 9:3 22:6.†

Abbott-Smith References

Book Refs
Mark 13:36
Luke 2:13 · 9:39
Acts 9:3 · 22:6

Liddell-Scott-Jones

ἐξαίφνης-ης,

adverb on a sudden, [Refs 8th c.BC+]participle, ψυχὴν θεωρεῖν . ἀποθανόντος ἑκάστου the moment that he is dead, [Refs 5th c.BC+]; ἀκούσαντι . at first hearing, [Refs 4th c.BC+]; but τὸ . the instantaneous, that which is between motion and rest, and not in the time-series, [Refs 5th c.BC+]; but, ={τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν}, [Refs 4th c.BC+]