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
The proud mom recently celebrated her twins' 17th birthday with a sweet video tribute on Instagram, which showed photos and clips of the family from throughout the years.
—
Hannah Sacks, People.com, 4 Apr. 2025
Celebrate a special someone with this birthday cake roundup.
—Nellah Bailey McGough, Southern Living, 4 Apr. 2025
Five decades and almost $3 trillion later, the company celebrates its 50th birthday on Friday from its sprawling campus in Redmond, Washington.
—Jordan Novet, CNBC, 4 Apr. 2025
The artist, born Kenneth Edward Rashaad Bailey, sadly died on his 39th birthday after suffering a fatal injury while running from police.
—Amber Corrine, VIBE.com, 4 Apr. 2025
See All Example Sentences for birthday
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Hannah Sacks, People.com, 4 Apr. 2025
Celebrate a special someone with this birthday cake roundup.
—Nellah Bailey McGough, Southern Living, 4 Apr. 2025
Five decades and almost $3 trillion later, the company celebrates its 50th birthday on Friday from its sprawling campus in Redmond, Washington.
—Jordan Novet, CNBC, 4 Apr. 2025
The artist, born Kenneth Edward Rashaad Bailey, sadly died on his 39th birthday after suffering a fatal injury while running from police.
—Amber Corrine, VIBE.com, 4 Apr. 2025
See All Example Sentences for birthday
Cite this Entry
“Birthday.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birthday. Accessed 13 Apr. 2025.
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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