πρῶτος

B. Superl., πρῶτος, -η, -ον,

[in LXX chiefly for רִאשׁוֹן, also for אֶחַד, etc. ;]

first,

1. of Time or Place;

(a) absol., as subst., ὁ π.., Luk.14:18, Jhn.19:32, 1Co.14:30; ὁ π. καὶ ὁ ἔσχατος, Rev.1:17 2:8 22:13; neut., τὸ π., opposite to τ. δεύτερον, Heb.10:9; τὰ π., opposite to τ. ἔσχατα, Mat.12:45, Luk.11:26, 2Pe.2:20; anarth., Mat.10:2; pl., Mat.19:30, Mrk.10:31, Luk.13:30; ἐν πρώτοις (EV, first of all), 1Co.15:3;

(b) as adj.: πρώτῃ; (sc. ἡμέρᾳ) σαββάτου, Mk 16:[9]; φυλακή, opposite to δευτέρα, Act.12:10…