τέταρτος · tetartos — LSJ
fourth, Il. 23.301, etc.
τὸ τέταρτον as Adv., the fourth time, 5.438, etc.: without Art., fourthly, Pl. Phdr. 266e: regul. Adv. -τως, fourfold, Id. Ti. 86a.
(sc. μέρος) a quarter, D.S. 1.50, POxy. 1293.25 (ii A.D.).
ἡ τετάρτη:
(sc. ἡμέρα) the fourth day, Hes. Op. 800, X. An. 4.8.21.
(sc. μοῖρα) a liquid measure, Hdt. 6.57:—also, a measure of weight, λαβὼν χρυσοῦ τετάρτας <β> PMag.Leid.V. 6.24, cf. 6.22.
a fourth part, ἐπὶ τετάρταις ἐργάζονται τῶν καρπῶν Str. 15.1.40.
tax of 25%, τ. ἐπὶ τοῖς καρποῖς App. Mith. 83, cf. SIG 4.8 (Cyzicus, vi B.C.); ὧν τετάρτη goods which pay a tax of 25%, PCair.Zen. 12.59, 70, al. (iii B.C.); τ. σιτοποιῶν ib. 206.34 (iii B.C.).
Τέταρτος, ὁ, a month in Locris, GDI 1901.2, 2097.5 (Delph., ii B.C.). (Skt. caturthás, Lith. ketviȓtas, Lat. quartus, etc.: l.-E. qṷeturto- and qṷetṷṛto-.)