δύνασις
From LSJ
ἐγώ εἰμι τὸ ἄλφα καὶ τὸ ὦ, ὁ πρῶτος καὶ ὁ ἔσχατος, ἡ ἀρχὴ καὶ τὸ τέλος → I am the Alpha and the Omega, the first and the last, the beginning and the end
English (LSJ)
[ῠ], εως, ἡ, poet. for δύναμις, Pi.P.4.238, B.9.49, S.Ant. 604 (lyr.), 952 (lyr.), E.Ion1012; ἐν (i.e. ἐς)
A δύνασιν pro virili parte, IG22.1126.5 (Amphict. Delph.).