σήμερον

κ, αμερον, Adv.

τήμερον

τῆτες

A. to-day, Il. 7.30, Od. 17.186, E. Rh. 683, PHib. 1.65.13 (iii B.C.), SIG 1181.11 (Rhenea, ii B.C.), Ev.Matt. 27.19, etc.; Dor. σάμερον [α] Pi. O. 6.28, P. 4.1; Att. τήμερον Cratin. 123, Ar. Eq. 68, etc., cf. Moer.p.364 P. (though σήμερον is sts. found in Com., Hermipp. 80, Philem. 121); εἰς τ. Pl. Smp. 174a; τὸ τ. ib.176e; τὸ τ. εἶναι to-day, Id. Cra. 396e; ἡ τ. ἡμέρα D. 4.40; also in the form τήμερα Ar. Fr. 401 (s.v.l.), cf. 296. (Prob. fr. κ y αμερον, containing stem [kcirc ]yo- 'this', cf. Lith. šis 'this', Lat. ci-tra: σήμερον(τήμερον) is to ἡμέρα as σῆτες(τῆτες) to ἔτος.)
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project