A.knowing how to use, understanding the use of a thing, “τῶν ὑπαρχόντων” Arist.Oec.1344b26; “δεσποτικὴ ἐπιστήμη ἡ χ. δούλων” Id.Pol.1255b31: abs., δύναμις χ., opp. ὑπηρετική, Procl. in Prm.p.735 S.: also c. dat. (like the Verb), M.Ant.7.55.
χρηστ-ικός , ή, όν, (χράομαι) of persons,