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
One video showed Lizzo blowing out her candles on a birthday cake before twerking, while pictures of another cake featured her album cover, depicting her as a middle finger.
—
Gabrielle Rockson, PEOPLE, 29 Apr. 2026
Shannda Aviugana-Durand, an education assistant known for sneaking kids candy on their birthdays, was killed at close range while students watched, the lawsuit alleged.
—Robert Pearlman, ArsTechnica, 29 Apr. 2026
Diaz manages her 18-year-old daughter Kiara Asiel and several other teenage girls who perform at birthday parties.
—Carlos Aguilar, Los Angeles Times, 29 Apr. 2026
Business leaders, cabinet members, and Supreme Court justices attended the event, which kicked off the United States’ 250th birthday celebrations.
—Stylecaster Editors, StyleCaster, 29 Apr. 2026
See All Example Sentences for birthday
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Gabrielle Rockson, PEOPLE, 29 Apr. 2026
Shannda Aviugana-Durand, an education assistant known for sneaking kids candy on their birthdays, was killed at close range while students watched, the lawsuit alleged.
—Robert Pearlman, ArsTechnica, 29 Apr. 2026
Diaz manages her 18-year-old daughter Kiara Asiel and several other teenage girls who perform at birthday parties.
—Carlos Aguilar, Los Angeles Times, 29 Apr. 2026
Business leaders, cabinet members, and Supreme Court justices attended the event, which kicked off the United States’ 250th birthday celebrations.
—Stylecaster Editors, StyleCaster, 29 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 1 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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