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ἅπαξ [ᾰπ], Adv. once, once only, once for all, first in Od., ὅτε τ' ἄλλοι ἅ. θνῄσκουσ' ἄνθρωποι 12.22; ἅ... ἀπὸ θυμὸν ὀλέσσαι ib.350; ἀπαλλάχθηθ' ἅ. E.Cyc.600; οὐχ ἅ. μόνον more than once, A.Pr.211; ἅ... κοὐχὶ δίς S.OC1208; πολλάκις καὶ οὐχὶ ἅ. Hdt.7.46; πολλάκις τε κοὐχ ἅ. S.OT1275; μὴ ἅ. ἀλλὰ πολλάκις Antipho 1.3, cf. Pl.Lg.711a; μὴ δίς, ἀλλ' ἅ. μόνον Arist.Pol.1299a10; of the self-creation of Νοῦς, τὴν ποίησιν αὑτοῦ ..ἅ. εἶναι Plot.6.8.21; ἅ. ἔτι yet this once, A.Ag.1322; τὸ ἅ. τοῦτο at this moment, LXX2 Ki.17.7; ἅ. δυοῖν ποδοῖν, i.e. two square feet (1 x 2), opp. δυοῖν δίς (2 x 2), four, Pl.Men.82c.

2. c. gen., ἅ. τοῦ ἐνιαυτοῦ, ἔτεος ἑκάστου ἅ., Hdt.2.59, 4.105; also ἐν τῷ ἐνιαυτῷ ἅ. Id.2.132.

3. once on a time, formerly, ἅ. καὶ ἅ. LXXJd.20.30.

II. without any notion of number, after conditional and temporal Particles, if once, when once, εἴπερ ἐσπείσω γ' ἅ. if once you have made a treaty, Ar.Ach.307. cf. 923; ἢν ἅ. ἁλῷ Id.V.898, cf. Av.342; ἂν ἅ. τις ἀποθάνῃ Amphis 8; ἐπειδήπερ γ' ἅ. ἐμοὶ σεαυτὸν παραδέδωκας Ar.V.1129; ἐπεὶ ἅ. ἐταράχθησαν Th.7.44; ὡς ἅ. ἤρξατο X.HG5.4.58; ἐπεὶ ἅ. αὐτοῖς φίλος ἐγένετο Id.An.1.9.10, cf. 3.2.25, Isoc.12.242; ὡς ἅ. ἐγκλήματα ἐταράχθη D.18.151: so with part., ἐπὶ γᾶν ἅ. πεσὸν ... αἷμα A.Ag.1019(lyr.); ἅ. θανόντος οὔτις ἔστ' ἀνάστασις Id.Eu.648; ἅ. ἐλθόντες Pl.Prm.165e, cf. Ep.Hebr.6.4, etc. (ἁ- = s (cf. εἷς); -παξ akin to πήγνυμι.)