ἑορτάζω,
I in Ion. Prose ὁρτάζω· impf. ἑώρταζον (with irreg. augm.) Isoc. 19.40, Paus. 4.19.4: fut. -άσω Luc. Merc.Cond. 16, Alciphr. 3.18, etc.: aor. ἑώρτασα D.C. 48.34, etc.; inf. ἑορτάσαι Ar. Ach. 1079, Pl. R. 458a; cf. διεορτάζω: (ἑορτή): - keep festival or holiday, Hdt. 2.60, 122, E. IT 1458, etc.; ἑορτὰς ἑ. celebrate festivals, X. Ath. 3.2; ἡμέρας τέτταρας Plu. Cam. 42; τὴν γενέθλιόν τινος OGI 493.26 (Ephesus, ii A.D.); ἑ. τῷ θεῷ Luc. Anach. 23.
II celebrate as a festival, νίκην ἑ. celebrate it by a festival, Plu. 2.349f, cf. Ant. 56; at Rome, celebrate by a triumph, D.C. 51.21.
G1858 — ἑορτάζω
(ἑορτή); to keep a feast-day, celebrate a festival: [1Co 5:8], on which passage see ἄζυμος. (the Sept. for חָגַג; Euripides, Aristophanes, Xenophon, Plato, others; ὁρτάζω, Herodotus.)