[ burth-dey ]
/ ˈbɜrθˌdeɪ /


the anniversary of a birth.
the day of a person's birth.
a day marking or commemorating the origin, founding, or beginning of something.
the festivities or celebration marking such a day or anniversary.

Origin of birthday

Middle English word dating back to 1350–1400; see origin at birth, day Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for birthday

British Dictionary definitions for birthday

/ (ˈbɜːθˌdeɪ) /


  1. an anniversary of the day of one's birth
  2. (as modifier)birthday present
the day on which a person was born
any anniversary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012