birthday

noun

birth·​day ˈbərth-ˌdā How to pronounce birthday (audio)
1
a
: the day of a person's birth
b
: a day of origin
2
: an anniversary of a birth
her 21st birthday

Examples of birthday in a Sentence

Her birthday is September 30th. Today is his 21st birthday. The company just celebrated its 50th birthday.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Although nothing has been announced for beyond the Sphere run, fans are convinced that that will not mark the end of the Dead’s birthday parties this year. Chris Willman, Variety, 12 Mar. 2025 Handler, an avid skier who spends her winters at Whistler Mountain in British Columbia, Canada, has a long-standing tradition of hitting the slopes in her bikini for her birthday. Catherine Santino, People.com, 12 Mar. 2025 This includes everything from coffee shop punch cards to discounts and free shipping from your favorite retailer on your birthday. Faisal Kutty, Newsweek, 12 Mar. 2025 The pair first started their fling turned serious romance at the backyard birthday party of a mutual friend’s kid, according to a new cover story in Vogue. Elizabeth Logan, Glamour, 11 Mar. 2025 See All Example Sentences for birthday

Word History

First Known Use

14th century, in the meaning defined at sense 2

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

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Cite this Entry

“Birthday.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birthday. Accessed 23 Mar. 2025.

Kids Definition

birthday

noun
birth·​day ˈbərth-ˌdā How to pronounce birthday (audio)
1
: the day or anniversary of one's birth
2
: the day or anniversary of a beginning

More from Merriam-Webster on birthday

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