εἴκοσι(forεἴκοσιν v.infr.), Att. , Ion. , also Arc.,IG 5(2).3.1 (Tegea), and Aeol. , ib. 12(2).6.21 (Lesbos):—indecl.,
A. twenty, Il. 2.510 , 748 , etc.; in Hom. more freq. in Ep. formἐείκοσι, before a vowelἐείκοσιν, 1.309 , 6.217 , al.; Dor.
ϝίκατι
Leg.Gort. 4.13 , etc.;ϝείκατι
Tab.Heracl. 2.71 ; Lacon.
βείκατι
Hsch. ;εἴκατι
IG 9(1).693.10 (Corc.), Theoc. 4.10 , 5.86 . (Orig.ϝῑ́κατιandἘϝῑ́κοσι, whenceἐείκοσιin Hom. ;ϝείκατιandεἴκατιare late spellings of (ϝ)ῑ́κατι; εἴκοσιis contr. fromἘϝῑ́κοσι. Cf. Lat.vīginti, Skt.viṃśatis. εἴκοσινis the only form used by Ar. , whether before vowels or consonants (εἴκος' ἀπολογίζεταιis dub. in Fr. 465 ); also (before consonants) Herod. 3.91 , Phld. Piet. 3 , etc., but not common in Inscrr. or Pap., e.g. (before consonants) Schwyzer 707
B 2 (Ephesus,vi B. C.), IG 2.804.155
(iv B.C.), (before a vowel) PGrenf. 2.75.7
(iv A. D.);εἴκοσι ἔτη, εἴκοσι ἡμερῶν, IG 12.94 , 49 .)