ἐξουςιαστής

οῦ, ὁ
A. mighty one, person in authority, LXX Is. 9.6(5), Cat.Cod.Astr. 5(3).86, PGen. 53.2 (iv A.D.).
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project