n. 1 the fact or condition of being the first-born child. 2 (in full right of primogeniture) the right of succession belonging to the first-born, esp. the feudal rule by which the whole real estate of an intestate passes to the eldest son. primogenital adj. primogenitary adj.
[ med.L primogenitura f. L primo first + genitura f. gignere genit- beget ]