birthday

noun

birth·​day ˈbərth-ˌdā How to pronounce birthday (audio)
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 Keeping Up with the Kardashians alum and dad to daughter Dream was born on March 17. 04 of 15 Coco Austin March 17, 1979 Model and reality star Coco Austin — who has been married to Ice-T since 2002 — also calls St. Patrick’s Day her birthday. Diane J. Cho, Peoplemag, 12 Mar. 2024 Some bishops continue serving for years after their 75th birthday. Sophie Carson, Journal Sentinel, 12 Mar. 2024 Jennifer O’Brien's treated her twin daughters to a skincare event for their birthday this year at a Sephora store. Parija Kavilanz, CNN, 12 Mar. 2024 Forti's son, barely 2 years old when his father was convicted, asked his mother for a special present for his 16th birthday: to visit his father in prison. Erin Moriarty, CBS News, 12 Mar. 2024 Bowling has only missed a handful of trivia nights over the years, which is why there was no better place to spend his birthday this past January. Katie Wiseman, The Indianapolis Star, 11 Mar. 2024 Alberts had plans to celebrate her upcoming birthday by baking fresh cookies before her death. Cnn.com, The Mercury News, 11 Mar. 2024 But not every celebrity at Sunday night’s bash was familiar with the eatery, where Kim Kardashian celebrated her 43rd birthday last year. Amy Kaufman, Los Angeles Times, 11 Mar. 2024 On his 15th birthday, the Durango teen spent a cold December afternoon chopping wood to help neighbors who couldn’t afford to heat their homes. The Denver Post, 9 Mar. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'birthday.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

14th century, in the meaning defined at sense 2

Time Traveler
The first known use of birthday was in the 14th century

Dictionary Entries Near birthday

Cite this Entry

“Birthday.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birthday. Accessed 19 Mar. 2024.

Kids Definition

birthday

noun
birth·​day ˈbərth-ˌdā How to pronounce birthday (audio)
1
: the day or anniversary of one's birth
2
: the day or anniversary of a beginning

More from Merriam-Webster on birthday

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!