A.hold power or lordship, be powerful or influential, Hdt.9.2, Isoc.12.82, OGI56.12, etc.; τὸ-εῦον, opp. δῆμος, Th.6.89; “ἡ πόλις τῶν λοιπέων ἐδυνάστευε μέγιστον” Hdt.5.97: c. gen., to be lord over, “Οἰχαλίας” D.S.4.31: metaph., “αἱ ἄλογοι ἡδοναὶ δ. ψυχῆς” Ph.1.19: c. dat., Ath.14.624d: generally, prevail, be prevalent, of a wind, of climate, Hp.Aph.3.5, Aër. 12; to be influential, potent, “ἐν τῷ σώματι” Id.VM16, cf. Herophil. ap. Gal.12.619:—Pass., to be ruled, “πρὸς μυρίων” Ph.2.503.
II. Math., in Pass., to be concerned with powers of numbers, Pl.R.546b.