Lexical Definition

‎δεκάτη‎ dekátē (dek-at'-ay) tenth ^G:A
feminine of ‎δέκατος‎

tenth (part), tithe.

• a tenth, i.e. as a percentage or (technically) tithe

Abbott-Smith

δεκάτη, -ης, ἡ prop. fem. (sc. μέρος) of δέκατος, -η, -ον, [in LXX for מַעֲשֵׂר: Ge 14:20, Ne 12:44, et al. ;]
a tenth part, a tithe: He 7:2, 4, 8, 9 (for a curious inversion of the Biblical use, v. MM, s.v.).†

Abbott-Smith References

Liddell-Scott-Jones

form of: δέκατος

δεκάτη

[Refs 4th c.AD+] δέκοτος [Refs 5th c.BC+], also Aeolic dialect in [Refs], η, ον: (δέκα):— tenth, Ἠώς [Refs 8th c.BC+]; as a round number, [Refs 8th c.BC+]

__II δεκάτη (i.e. μερίς), ἡ, tenth part, tithe, τᾶς δεκάτας δεκάταν [Refs 5th c.BC+]; τὰ ἐκ τῆς δ. the produce of the tenth, [Refs 4th c.BC+]
__II.2 δεκάτη (i.e. ἡμέρα), ἡ, the tenth day, [Refs 8th c.BC+]
__II.2.b δ. προτέρα· ἡ πρὸ εἰκάδος, ὡς ὑστέρα· ἡ μετ᾽ εἰκάδα, [Refs 5th c.AD+]
__II.3 festival on the tenth day after birth, when the child has a name given it, τὴν δ. θύειν to give a naming-day feast, [Refs 5th c.BC+]
__II.4 δεκάτα· τάξις, ἄθροισμα, καὶ ἡ τῶν εἴκοσιν ἁρμάτων τάξις, [Refs 5th c.AD+]
__II.5 δέκατον, τό, tenth part, [LXX]

_{LSJ Scripture Refs: LXX.Lev.23.13}