efficient adjective
Category: causality.
1604, Cawdrey:
working, or accomplishing.
1626, Cockeram:
which bringeth to passe.
1658, Phillips:
(lat.) causing to come to pass, it is a word chiefly applied to one of the four causes treated of in Logick. Researcher's notes: Aristotle's four causes are the material, the formal, the efficient, and the final.