A.for or in the way of exchange, “ἡ [χρῆσις] ἡ μ.” Arist.Pol.1257a9: ἡ -κή (sc. τέχνη) exchange, barter, Pl.Sph.223d, Arist.Pol.1258b21: τὸ -κόν (sc. γένος) Pl.Sph.224d. Adv. -“κῶς” Poll.4.51.
II. able to produce change, “ἀρχή” Arist.Metaph.1020a5, cf. 1013a32; “δύναμις” Ph.1.278; “κίνησις” S.E.M.9.195.