To make lawful; establish the legitimacy or propriety of.To render legitimate, as a bastard; invest with the rights of a legitimate child or lawful heir, as one born out of wedlock.According to law, rule, or precedent; agreeable to established principles or standards; in conformity with custom or usage; lawful; regular; orderly; proper: as, a legitimate king or government; the legitimate drama; a legitimate subject of debate; legitimate trade.Specifically Of lawful birth; born in wedlock, or of parents legally married: as, legitimate children; a legitimate heir.Justly based on the premises; logically correct, allowable, or valid: as, a legitimate result; legitimate arguments or conclusion.Synonyms Legal, Licit, etc. See lawful.n. By ellipsis, legitimate drama (which see, under legitimate).n. An emigrant to Australia who had ‘legal reasons’ for emigrating.n. A legitimate child.n. Something to which one has a legal right. Milton, Eikon., 31.