A.of or belonging to a rule, “ἀρχή” A.D.Adv. 141.29; regular, according to rule, “διαφοραί” Gal.7.417; “ἀναλογία” Eust. 113.40, etc. Adv “-κῶς” Artem.1.1a.
II. ἡ -κή (sc. τέχνη) the mathematical theory of music (Pythag., cf. Ptolemaisap.Porph.in Harm.p.207), based on the division of the monochord (cf. “κανών” 1.10), Gell.16.18; κ. θεωρία, τέχνη, Ph.1.22, Procl.in Euc.p.40F.