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.
His last day is Thursday, which happens to be his 66th birthday. Nick Ferraro, Twin Cities, 7 Nov. 2024 After Midnight: Sorry, Scorpios Tomlinson started out by offering her condolences to anyone who has a birthday this week. Bethy Squires, Vulture, 6 Nov. 2024 When Josh's birthday comes around each year, the absence of his mom's special text is deeply felt. David Faris, Newsweek, 4 Nov. 2024 My dad’s birthday was always at my house with his oyster stew. Angela Andaloro, People.com, 4 Nov. 2024 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

Dictionary Entries Near birthday

Cite this Entry

“Birthday.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birthday. Accessed 21 Nov. 2024.

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

Last Updated: - Updated example sentences
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