[ ˌprʌɪmə(ʊ)'dʒɛnɪtʃə ]
■ noun the state of being the firstborn child.
↘a rule or tradition of inheritance by the firstborn child.
Derivatives
primogenital adjective
primogenitary adjective
Origin
C17: from med. L. primogenitura , from L. primo 'first' + genitura 'geniture'.