(1):

(n.) To utilize; to make available; to get the value or usefulness out of; as, to exploit a mine or agricultural lands; to exploit public opinion.

(2):

(n.) Combat; war.

(3):

(n.) A deed or act; especially, a heroic act; a deed of renown; an adventurous or noble achievement; as, the exploits of Alexander the Great.

(4):

(n.) Hence: To draw an illegitimate profit from; to speculate on; to put upon.