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
Yuengling is celebrating America's birthday all year by proudly showing off the 250th on its cans.
—
Nikki Dementri, CBS News, 15 Apr. 2026
Robinson’s most recent Instagram posts included photos of her and McCann celebrating her 31st birthday on the safari trip in Tanzania.
—Deena Zaru, ABC News, 15 Apr. 2026
My mom just passed, and her birthday was, like, five days ago.
—Angie Martoccio, Rolling Stone, 14 Apr. 2026
The San Diego native recently celebrated his 29th birthday, and this weekend, Mysterio will be battling against Finn Bálor, his former mentor and ex-leader of the WWE faction The Judgement Day, at WrestleMania 42.
—Carlos Rico, San Diego Union-Tribune, 14 Apr. 2026
See All Example Sentences for birthday
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Nikki Dementri, CBS News, 15 Apr. 2026
Robinson’s most recent Instagram posts included photos of her and McCann celebrating her 31st birthday on the safari trip in Tanzania.
—Deena Zaru, ABC News, 15 Apr. 2026
My mom just passed, and her birthday was, like, five days ago.
—Angie Martoccio, Rolling Stone, 14 Apr. 2026
The San Diego native recently celebrated his 29th birthday, and this weekend, Mysterio will be battling against Finn Bálor, his former mentor and ex-leader of the WWE faction The Judgement Day, at WrestleMania 42.
—Carlos Rico, San Diego Union-Tribune, 14 Apr. 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 18 Apr. 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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