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

Coincidentally, Johnson pointed out in his video that a friend of his gave him a photo of himself with Hobbs for his birthday that matched the image Orion used for his drawing. —Tommy McArdle, People.com, 23 May 2025

News of the forthcoming record arrives almost one year to the day since Weller’s last album, 66, which arrived on May 24, 2024 – one day before his 66th birthday. —Tyler Jenke, Billboard, 22 May 2025

Wednesday, June 25: Benefits for those with birthdays between the 21st and 31st. —Aliss Higham, MSNBC Newsweek, 22 May 2025

The indictment alleges the trio spent loan money on personal expenses, including a birthday party for Brown. —Mary Ramsey, Charlotte Observer, 22 May 2025

Word History

First Known Use

14th century, in the meaning defined at sense 2

Phrases Containing birthday

• birthday suit

Rhymes for birthday

• airway
• allay
• archway
• array
• ashtray
• astray
• aue
• away
• ballet
• belay
• beltway
• beret

Kids Definition

birthday

noun

birth·​day ˈbərth-ˌdā 

1

: the day or anniversary of one's birth

2

: the day or anniversary of a beginning