\Pri`mo*gen"i*ture\ (?; 135), n. [LL., fr. L.
primus first + genitura a begetting, birth, generation, fr.
genere, gignere, to beget: cf. F. primog['e]niture, L.
primogenitus firstborn. See {Prime}, a., and {Genus}, {Kin}.]
1. The state of being the firstborn of the same parents;
   seniority by birth among children of the same family.
2. (Eng. Law) The exclusive right of inheritance which
   belongs to the eldest son. Thus in England the right of
   inheriting the estate of the father belongs to the eldest
   son, and in the royal family the eldest son of the
   sovereign is entitled to the throne by primogeniture. In
   exceptional cases, among the female children, the crown
   descends by right of primogeniture to the eldest daughter
   only and her issue. --Blackstone.