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
Coles and Favre played one season together and eventually became friendly enough for Favre to show up for Coles’ birthday party.
—
Dan Pompei, New York Times, 2 Dec. 2025
McBee will also miss the first birthday celebrations for Cole and Kacie's daughter, Blair.
—Moná Thomas, PEOPLE, 2 Dec. 2025
The second episode of season 4 takes place on Will’s birthday, March 22, and yet there is no mention of it in the entire episode, leading many fans to assume that Will's friends and family had all forgotten it.
—Emlyn Travis, Entertainment Weekly, 1 Dec. 2025
At the time of the shooting, the birthday party had drawn 100 to 150 guests, Sheriff’s Office spokesperson Heather Brent said.
—Kathleen Quinn, Sacbee.com, 1 Dec. 2025
See All Example Sentences for birthday
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Dan Pompei, New York Times, 2 Dec. 2025
McBee will also miss the first birthday celebrations for Cole and Kacie's daughter, Blair.
—Moná Thomas, PEOPLE, 2 Dec. 2025
The second episode of season 4 takes place on Will’s birthday, March 22, and yet there is no mention of it in the entire episode, leading many fans to assume that Will's friends and family had all forgotten it.
—Emlyn Travis, Entertainment Weekly, 1 Dec. 2025
At the time of the shooting, the birthday party had drawn 100 to 150 guests, Sheriff’s Office spokesperson Heather Brent said.
—Kathleen Quinn, Sacbee.com, 1 Dec. 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 7 Dec. 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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