Definition of firstborn in English:

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firstborn

Pronunciation: /ˈfərs(t)bôrn/

adjective

(Of a person’s child) the first to be born; the eldest: his new album and his firstborn child are due in the same week
More example sentences
  • There are 5 million couples living out of wedlock in France, and 42% of firstborn children are born outside of marriage.
  • Over 70 percent of firstborn children are born to unmarried couples.
  • I was their firstborn child, their baby girl, the very embodiment of their hopes and dreams.

noun

A person’s first child: their firstborn arrived
More example sentences
  • Since moms and dads are usually way worried about giving firstborns the go-ahead for new experiences, you've forged a path in uncharted territory.
  • Some weeks previously John and I had taken our firstborns away for a much-talked-about weekend to Paris, so it was only fair that the secondborns should go somewhere too.
  • Your sisters and mother are waiting for you with the other firstborns.

For editors and proofreaders

Syllabification: first·born

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