of or for a θέμα:
that in which a valuable prize is proposed, ἀγὼν θ., opp. στεφανίτης and φυλλίτης, Poll. 3.153, cf. IG 3.128.20, IGRom. 4.1432.20, 1442.8 (Smyrna), LW 894.17 (Delph.); τρόπος θ. a style calculated for effect, Plu. Mus. 2.1135c; cf. θεματίτης.
arbitrarily fixed, traditional, παρατηρήσεις Phld. Rh. 1.195S.: -κόν, τό, ib. 151S.
Gramm., primary, not derivative, e.g. ἄμφω, which has no sg., EM 91.33: θεματικά, τά, elements, ib. 232.21: Comp., θεματικώτερα <μέρη> τοῦ λόγου ὀνόματά ἐστι καὶ ῥήματα principal parts, A.D. Adv. 121.5; -ώτεραι αἱ πρωτότυποι ἐν τοῖς γένεσιν the personal pronouns form their genders from different θέματα, Id. Pron. 110.24. Adv. Comp. -ώτερον, κλιθῆναι by means of different θέματα, e.g. ἐγώ, ἐμοῦ, Id. Synt. 102.4.