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
My maiden visit came with my mum and dad in 1982 as a ninth birthday treat.
—
Richard Sutcliffe, New York Times, 7 Oct. 2025
Lawrence finished the night with 10 carries for 54 yards and two touchdowns — on his 26th birthday.
—Kansas City Star, 7 Oct. 2025
Another new recommendation will mean toddlers get their first vaccines against measles and chickenpox separately, around their first birthdays.
—Brenda Goodman, CNN Money, 6 Oct. 2025
It should be noted that this was an adult's birthday lunch.
—Devonne Goode, Parents, 6 Oct. 2025
See All Example Sentences for birthday
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Richard Sutcliffe, New York Times, 7 Oct. 2025
Lawrence finished the night with 10 carries for 54 yards and two touchdowns — on his 26th birthday.
—Kansas City Star, 7 Oct. 2025
Another new recommendation will mean toddlers get their first vaccines against measles and chickenpox separately, around their first birthdays.
—Brenda Goodman, CNN Money, 6 Oct. 2025
It should be noted that this was an adult's birthday lunch.
—Devonne Goode, Parents, 6 Oct. 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 9 Oct. 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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