A.mathematical proportion, Pl.Ti. 31c, 32c; “ἡ ἀ. ἰσότης ἐστὶ λόγων” Arist.EN1131a31; of progressions, ἀ. γεωμετρική ib.b13; ἀριθμητική ib.1106a36, cf. Ael.Tact.10.3; ἁρμονική Thrasyll. ap. Theo.Sm.p.85H., Nicom.Ar.2.22; “κατὰ τὴν ἀ.” comparing the ratios, Arist.Pol.1282b40; τὸ κατ᾽ ἀ. ἴσον ib.1301a27; “ὑπὲρ τὴν ἀ. τινός” out of proportion, Olymp. in Mete.89.22.
II. analogy, Arist.HA486b19, Epicur.Fr.212, etc.
2. esp. grammatical analogy, Gell.2.25, A.D.Synt.36.23, etc.