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 can join for free and receive a free birthday gift in the form of a discount code delivered by email during their birthday month, along with access to member-exclusive deals, limited-edition releases, and early access to new products, as well as upcoming sales.
—
Jessica Chapel, Condé Nast Traveler, 6 May 2026
Now, as what would have been Marilyn’s 100th birthday approaches, Haspiel is not surprised that fans around the world still adore her.
—Kc Baker, PEOPLE, 6 May 2026
Last year, on Archie's 6th birthday, Meghan shared a photo of her son looking out at the ocean with the sun in front of him.
—ABC News, 6 May 2026
On the day of the strike — which was also his 7th birthday — the first-grader wore a blue sweater because of the morning chill.
—Zohreh Saberi, Los Angeles Times, 6 May 2026
See All Example Sentences for birthday
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Jessica Chapel, Condé Nast Traveler, 6 May 2026
Now, as what would have been Marilyn’s 100th birthday approaches, Haspiel is not surprised that fans around the world still adore her.
—Kc Baker, PEOPLE, 6 May 2026
Last year, on Archie's 6th birthday, Meghan shared a photo of her son looking out at the ocean with the sun in front of him.
—ABC News, 6 May 2026
On the day of the strike — which was also his 7th birthday — the first-grader wore a blue sweater because of the morning chill.
—Zohreh Saberi, Los Angeles Times, 6 May 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 8 May. 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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