Legitimate meaning : A person born to a legally married couple. To make legitimate, lawful, or valid; especially, to put in the position or state of a legitimate person before the law, by legal means. In accordance with the law or established legal forms and requirements. Conforming to known principles, or established or accepted rules or standards; valid. Authentic, real, genuine. Lawfully begotten, i.e., born to a legally married couple. Relating to hereditary rights.