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
Junior Grace Simmons escaped an early jam to set the tone for a low-scoring complete game from the circle, and Aniyah Bailey had a birthday to remember by anchoring the team’s contagious offensive showing with two doubles and five RBI in a 3-for-4 day.
—
Tom Mulherin, Boston Herald, 11 June 2026
This story is part of USA 250 Most Treasured Views, a USA TODAY Network project exploring places across America with historical and cultural significance, created in celebration of the USA 250 initiative marking the nation’s 250th birthday.
—Usa Today Network, USA Today, 10 June 2026
From June 26 through July 5, the Stockyards will celebrate the nation’s 250th birthday.
—Fort Worth Star-Telegram, 10 June 2026
According to the father, Lucy was spending the weekend with the Pinos for their daughter's 18th birthday celebration.
—Nikiya Carrero, CBS News, 10 June 2026
See All Example Sentences for birthday
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Tom Mulherin, Boston Herald, 11 June 2026
This story is part of USA 250 Most Treasured Views, a USA TODAY Network project exploring places across America with historical and cultural significance, created in celebration of the USA 250 initiative marking the nation’s 250th birthday.
—Usa Today Network, USA Today, 10 June 2026
From June 26 through July 5, the Stockyards will celebrate the nation’s 250th birthday.
—Fort Worth Star-Telegram, 10 June 2026
According to the father, Lucy was spending the weekend with the Pinos for their daughter's 18th birthday celebration.
—Nikiya Carrero, CBS News, 10 June 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 13 Jun. 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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