birthday
noun
birth·day
ˈbərth-ˌdā 
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
In contrast, Arkansas handed a win to Coach John Calipari on his 67th birthday.
—
Matt Byrne, Arkansas Online, 11 Feb. 2026
Avoid passwords tied to your name, birthday or location.
—Kurt Knutsson, FOXNews.com, 10 Feb. 2026
Jorge, who celebrated his birthday in December at Dilley with a tiny cake made from vanilla commissary cookies, spent most of the day sleeping.
—Mica Rosenberg, CNN Money, 10 Feb. 2026
Just last month, her stepmother offered to pay for her plane ticket so Ellianna could return to Charlotte for her birthday this month with a promise to make a batch of her favorite empanadas.
—Charlotte Observer, 10 Feb. 2026
See All Example Sentences for birthday
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Matt Byrne, Arkansas Online, 11 Feb. 2026
Avoid passwords tied to your name, birthday or location.
—Kurt Knutsson, FOXNews.com, 10 Feb. 2026
Jorge, who celebrated his birthday in December at Dilley with a tiny cake made from vanilla commissary cookies, spent most of the day sleeping.
—Mica Rosenberg, CNN Money, 10 Feb. 2026
Just last month, her stepmother offered to pay for her plane ticket so Ellianna could return to Charlotte for her birthday this month with a promise to make a batch of her favorite empanadas.
—Charlotte Observer, 10 Feb. 2026
See All Example Sentences for birthday
Cite this Entry
“Birthday.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birthday. Accessed 16 Feb. 2026.
Copy CitationKids Definition
birthday
noun
birth·day
ˈbərth-ˌdā
1
: the day or anniversary of one's birth
2
: the day or anniversary of a beginning
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