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
Some estates, Dallas notes, are selectively rented for milestone birthdays, family gatherings and pre-wedding celebrations.
—
Kate Hardcastle, Forbes.com, 27 May 2026
On his 90th birthday last year, the Dalai Lama insisted Chinese authorities would have no role in identifying his successor and the institution of the Dalai Lama would continue after his death.
—ABC News, 27 May 2026
To celebrate the highway’s 100th birthday, the city hopes to set a Guinness World Record for the largest-ever classic car parade via an event called Tulsa’s Route 66 Capital Cruise on May 30.
—Joe Yogerst, CNN Money, 27 May 2026
New York City is in for a busy summer, with several major events taking place, including the World Cup, the NBA Finals, and America's 250th birthday celebrations.
—Lisa Rozner, CBS News, 27 May 2026
See All Example Sentences for birthday
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Kate Hardcastle, Forbes.com, 27 May 2026
On his 90th birthday last year, the Dalai Lama insisted Chinese authorities would have no role in identifying his successor and the institution of the Dalai Lama would continue after his death.
—ABC News, 27 May 2026
To celebrate the highway’s 100th birthday, the city hopes to set a Guinness World Record for the largest-ever classic car parade via an event called Tulsa’s Route 66 Capital Cruise on May 30.
—Joe Yogerst, CNN Money, 27 May 2026
New York City is in for a busy summer, with several major events taking place, including the World Cup, the NBA Finals, and America's 250th birthday celebrations.
—Lisa Rozner, CBS News, 27 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 29 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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