Webster's English Dictionary

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primogeniture

pri.mo.gen.i.ture \-'jen-*-.chu.(*)r, -i-ch*r, -*-.t(y)u.(*)r\ n [LL 
   primogenitura, fr. L primus + genitura birth, fr. geni]tus, pp. 1: the 
   state of being the firstborn of the children of the same parents  2: an 
   exclusive right of inheritance belonging to the eldest son