ἰσ-άριθμος · is-arithmos — LSJ
equal in number with, ψυχαὶ ἰ, τοῖς ἄστροις Pl. Ti. 41d, cf. Lg. 845a, Arist. EN 1156a7, al., Call. Del. 175, Puchstein Epigr.Gr. p.9; εἰσαρίθμοις ἔπεσι,= ἰσοψήφοις, IG 5(1).257 (Laconia): poet. ἰσήριθμος, AP 6.84 (Paul.Sil.), 328 (Leon.), Lyc. 1258. Adv. ἰσάριθμως Gal. 19.469, Them. Or. 33.367b.
Gramm., of the same grammatical number, A.D. Synt. 170.13. Adv. -μως ib. 143.9.