|prīmō|jenəˌchu̇(ə)r, -u̇ə, -nə̇chə(r) noun
Etymology: Late Latin primogenitura, from Latin primus first + genitura birth, from genitus (past participle of gignere to beget) + -ura -ure — more at kin
1. : the state of being the firstborn of the children of the same parents
2. : an exclusive right of inheritance ; specifically : a right belonging under English law to the eldest son or failing lineal descendants the eldest male in the next degree of consanguinity to take all the real estate of which an ancestor died seized and intestate to the exclusion of all female and younger male descendants of equal degree