firstborn

adjective

first·​born ˈfərs(t)-ˈbȯrn How to pronounce firstborn (audio)
: first brought forth : eldest
firstborn noun

Examples of firstborn in a Sentence

Recent Examples on the Web
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Parents could be more likely to seek diagnoses for their firstborn than any subsequent children. Will Barker, TheWeek, 30 Apr. 2026 Unlike their firstborn, Indy was born in the hospital. Katie Mannion, PEOPLE, 28 Apr. 2026 Nevada Alexander Musk's firstborn son tragically passed away at just 10 weeks old from Sudden Infant Death Syndrome in 2002. Emma Banks, InStyle, 11 Apr. 2026 Because their firstborn son had just died, and so that was horrific. Marc Weingarten, Los Angeles Times, 4 Apr. 2026 See All Example Sentences for firstborn

Word History

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of firstborn was in the 14th century

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Cite this Entry

“Firstborn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/firstborn. Accessed 6 May. 2026.

Kids Definition

firstborn

adjective
first·​born ˈfərs(t)-ˈbȯ(ə)rn How to pronounce firstborn (audio)
: born first : eldest
firstborn noun

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