Extended Strong's Greek Lexicon (Abbott-Smith based)
once
Usage: ἅπαξ adv., [in LXX for אֶחָד, פַּעַם ;] __(a) once: 2Co.11:25, Heb_9:26-27; ἔτι ἅ., Heb.12:26-27; ἅ. τ. ἐνιαυτοῦ, Heb.9:7; καί ἅ. κ. δίς, twice: Php.4:16, 1Th.2:18; __(b) once for all: Heb.6:4 9:28 10:2, 1Pe.3:18, Ju 3 5 (MM, VGT, see word).† (AS)