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
Kansas City’s official Fourth of July was a multilayer celebration for America’s 250th birthday, the centennial of the National World War I Museum and Memorial, and for the 2026 FIFA World Cup.
—
Sophia Buonpane,
Kansas City Star,
5 July 2026
As America begins to celebrate its 250th birthday on Saturday, there are nearly 800,000 customers without power as outages are reported across multiple states.
—
Jon Haworth,
ABC News,
5 July 2026
Despite triple-digit heat indexes, visitors from across the country gathered in Philadelphia today to celebrate the nation's 250th birthday at the birthplace of American independence.
—
Kyla Guilfoil,
NBC news,
5 July 2026
Pittsburgh's Independence Day festivities commemorating America's 250th birthday will take place on Saturday, July 4 with music, family fun and food.
—
Finch Walker,
USA Today,
4 July 2026
See All Example Sentences for birthday
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Sophia Buonpane,
Kansas City Star,
5 July 2026
As America begins to celebrate its 250th birthday on Saturday, there are nearly 800,000 customers without power as outages are reported across multiple states.
—
Jon Haworth,
ABC News,
5 July 2026
Despite triple-digit heat indexes, visitors from across the country gathered in Philadelphia today to celebrate the nation's 250th birthday at the birthplace of American independence.
—
Kyla Guilfoil,
NBC news,
5 July 2026
Pittsburgh's Independence Day festivities commemorating America's 250th birthday will take place on Saturday, July 4 with music, family fun and food.
—
Finch Walker,
USA Today,
4 July 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 5 Jul. 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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