Definition of firstborn adjective from the Oxford Advanced Learner's Dictionary

 

firstborn

 adjective
adjective
BrE BrE//ˈfɜːstbɔːn//
 
; NAmE NAmE//ˈfɜːrstbɔːrn//
 
[only before noun](old-fashioned)
 
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born before any of a person's other children their firstborn son

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