Definition:
ἐνεργέω, -ῶ [in LXX: Num.8:24 B (עֲבֹדָה צָבָא), Isa.41:4, Pro.21:6 (פָּעַל), Pro.31:12 (גָּמַל), I Est.2:20, Wis.15:11 16:17 *;] (for full lexical treatment, see AR, Eph., 243 ff.); 1) intrans, to be at work or in action, to operate (opposite to ἀργέω): before ἐν, with dative of person(s), Mat.14:2, Mrk.6:14, Eph.2:2; with dative of person(s), before εἰς (Lft, in l), Gal.2:8. 2) Trans, to work, effect, do: with accusative of thing(s), 1Co.12:11, Eph.1:11; id, before ἐν, with dative of person(s), 1Co.12:6, Gal.3:5, Php.2:13; ἐ. ἐνέργειαν, Eph.1:19-20 Pass. (taken as mid. by Lft, Ga., 204 f; but see AR, Eph., l.with; Milligan, Th., 28 f; Mayor, Ja., 177 ff.), in NT, "always used of some principle or power at work" (Meyer), to be actuated, set in operation: 2Th.2:7; before ἐν, Rom.7:5, 2Co.1:6 4:12, Eph.3:20, Col.1:29, 1Th.2:13; before διά, with genitive of thing(s), Gal.5:6; ἐνεργουμένη (M, Pr., 156), Jas.5:16 (Cremer, 262). (AS)