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 honor of her birthday, here's a look back at her career and life in photos.
—
Alexandra Schonfeld, PEOPLE, 14 Jan. 2026
Last year was the event’s fortieth birthday.
—Brittany Allen, Literary Hub, 13 Jan. 2026
A little more than two months shy of his 40th birthday, Lowry has played just 43 minutes over five games this season.
—Eric Koreen, New York Times, 13 Jan. 2026
Want a birthday shoutout in the Politically Georgia newsletter?
—Adam Beam, AJC.com, 13 Jan. 2026
See All Example Sentences for birthday
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Alexandra Schonfeld, PEOPLE, 14 Jan. 2026
Last year was the event’s fortieth birthday.
—Brittany Allen, Literary Hub, 13 Jan. 2026
A little more than two months shy of his 40th birthday, Lowry has played just 43 minutes over five games this season.
—Eric Koreen, New York Times, 13 Jan. 2026
Want a birthday shoutout in the Politically Georgia newsletter?
—Adam Beam, AJC.com, 13 Jan. 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 17 Jan. 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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