Lewis & Short

entĕlĕchīa, ae, f., = ἐντελέχεια, in the lang. of the Aristotelian philosophy, actuality, Tert. Anim. 32; Macr. Somn. Scip. 1, 14; cf. Cic. Tusc. 1, 10, 22 (v. Lidd. and Scott, s. v. ἐντελέχεια).