δέκατος
Etym. δέκα
I. "tenth", Hom., etc.
II. δεκάτη, sc. μερίς "the tenth part, tithe", Hdt., etc.
2. δεκάτη (sc. ἡμέρα), "the tenth day", Hom.; at Athens, "the tenth day after birth", when the child has a name given it, τὴν δ. θύειν to give a "naming-day" feast, Ar.; τὴν δ. ἑστιᾶσαι ὑπὲρ τοῦ υἱοῦ Dem.