Working or acting for reward; hired; serving only for gain; selling one's services to the highest bidder.Hence Venal; sordid; actuated only by hope of reward; ready to accept dishonorable gain: as, a mercenary prince or judge; a mercenary disposition.Pertaining or due to hope of gain or reward; done, given, etc., in return for hire; resulting from sordid motives: as, mercenary services; a mercenary act.Synonyms Hireling, etc. See venal.n. A person who works for pay: especially, one who has no higher motive to work than love of gain.n. Specifically, a soldier in foreign service; a professional soldier.