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
Members of the 34th Infantry Division were in attendance at Halverson’s celebration Monday and took the chance to shake his hand and wish him a happy birthday.
—
Imani Cruzen, Twin Cities, 24 Feb. 2026
Iryna Tsybukh, a public activist, a Hospitaller combat medic, and my friend, was killed on May 29, 2024, on the front line near Kharkiv, just days before her 26th birthday.
—Daria Kolomiec, Time, 24 Feb. 2026
The couple reconnected years later at a surprise birthday party for a mutual friend.
—Hanna Wickes, Charlotte Observer, 24 Feb. 2026
Miguel Rojas celebrated his 37th birthday with a pair of singles.
—Bill Plunkett, Oc Register, 24 Feb. 2026
See All Example Sentences for birthday
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Imani Cruzen, Twin Cities, 24 Feb. 2026
Iryna Tsybukh, a public activist, a Hospitaller combat medic, and my friend, was killed on May 29, 2024, on the front line near Kharkiv, just days before her 26th birthday.
—Daria Kolomiec, Time, 24 Feb. 2026
The couple reconnected years later at a surprise birthday party for a mutual friend.
—Hanna Wickes, Charlotte Observer, 24 Feb. 2026
Miguel Rojas celebrated his 37th birthday with a pair of singles.
—Bill Plunkett, Oc Register, 24 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 1 Mar. 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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