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
This is celebrating America’s birthday.
—
Lori A Bashian, FOXNews.com, 4 June 2026
Enter your birthday, name and email address into the State Farm Arena Golden Ticket Giveaway website for your chance to win.
—Irene Wright, USA Today, 3 June 2026
That’s not easy to do in the USHL, which is a hard league to succeed in at that age, especially as a center — and even more so because of his August birthday.
—Scott Wheeler, New York Times, 3 June 2026
Marilyn Monroe through the female gaze Marilyn Monroe would have celebrated her 100th birthday this week.
—Alexandra Banner, CNN Money, 3 June 2026
See All Example Sentences for birthday
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Lori A Bashian, FOXNews.com, 4 June 2026
Enter your birthday, name and email address into the State Farm Arena Golden Ticket Giveaway website for your chance to win.
—Irene Wright, USA Today, 3 June 2026
That’s not easy to do in the USHL, which is a hard league to succeed in at that age, especially as a center — and even more so because of his August birthday.
—Scott Wheeler, New York Times, 3 June 2026
Marilyn Monroe through the female gaze Marilyn Monroe would have celebrated her 100th birthday this week.
—Alexandra Banner, CNN Money, 3 June 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 4 Jun. 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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