ἐφάπαξ [ᾰπ],
Adv.
I once for all, Eup. 175, [Rom 6:10], [Heb 7:27], etc.
II at once, Cor. 15.6.
G2178 — ἐφάπαξ
(Treg. in Heb. ἐφ' ἅπαξ; cf. Lipsius, gram. Unters., p. 127), adverb (from ἐπί and ἅπαξ (cf. Winers Grammar, 422 (393); Buttmann, 321 (275))), once; at once i. e.
a. our all at once: [1Co 15:6].
b. our once for all: [Rom 6:10]; [Heb 7:27]; [Heb 9:12]; [Heb 10:10]. (Lucian, Dio Cassius, others.)