Pronunciation: (prī"mu-jen'i-chur, -choor"), [key]
1. the state or fact of being the firstborn of children of the same parents.
2. Law.the system of inheritance or succession by the firstborn, specifically the eldest son. Cf. postremogeniture.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.