Merriam-Webster's Collegiate® Dictionary, 11th Edition
EXPLOIT
I. noun
Etymology: Middle English espleit, expleit, exploit furtherance, outcome, from Anglo-French, from Latin explicitum, neuter of explicitus, past participle
Date: circa 1538
deed , act , see: feat
II. transitive verb
Date: 1838
to make productive use of ; utilize , to make use of meanly or unfairly for one's own advantage , exploitability noun exploitable adjective exploiter noun