/ ˌpraɪməʊˈdʒenɪtʃə(r); NAmE -moʊ-/ noun [ U ]
1.
( formal ) the fact of being the first child born in a family
2.
( law ) the system in which the oldest son in a family receives all the property when his father dies
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WORD ORIGIN
early 17th cent.: from medieval Latin primogenitura , from Latin primo first + genitura geniture (a person's birth).