A.at work, active, busy, Hdt.8.26, etc.; ζῷα ἐ., opp. εἴδωλα ἀκίνητα, X.Mem.1.4.4; “δικασταί, κυβερνῆται, ἐ. ὄντες” on duty, Pl.Lg.674b; ὅπως ἂν ἐ. ὦσι that they may begin business, D.35.7; “ἐ. περί τι γίγνεσθαι” Plb.3.17.4; effective, fit for service, νῆες, στράτευμα, Th.3.17, X.Cyr.2.2.23; “πεζὸν σὺν ἵπποις -ότατον” Id.Eq.Mag.9.7; ἐ. προσβολή vigorous attack, Plb.4.63.8; ἐ. ὑσσοί effective javelins, Id.1.40.12; “πελέκεις” D.S.5.39; ἐ. ποιεῖσθαι τὴν πορείαν march with rapidity, Plb.5.8.3; “τὸ τῆς ὥρας πρὸς τὰς νόσους -ότατον” D.S.14.70; τόποι (in logical sense) “-ότατοι” most effective, Arist.Top.154a16; ἡ γεωργία ἐ. ποιεῖ τὴν τροφήν calls into action the nutritive properties (of the soil), Id.Pr.924a17.
2. actual, opp. potential, Theol.Ar.6, 12.
II. of land, productive, opp. ἀργός, X.Cyr.3.2.19, cf. 5.4.25, HG4.4.1, Plu.Sol.31 (Comp.); simply, tilled, SIG685.72 (Itanos); πεδίον πολλαῖς ἐνεργὸν μυριάσι producing enough for multitudes, Plu. Caes.58; “μυλαῖον ἐ.” in working order, PRyl.167.10 (i A.D.); also of mines, X.Vect.4.2; ἐνεργά (sc. χρήματα) employed capital, which brings in a return, D.27.7,10, cf. X.Hier.11.4; “θησαυρὸς ἐ.” PLond.2.216 (i A.D.); τὸ δάνειον ἐ. ποιεῖν to put out to interest, D.56.29.