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[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
1350-1400; Middle English; see birth, day Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for birthday
  • Consider using the date of your birthday each month to remind you to go out exploring.
  • Have each student commit to doing an exploration activity on the date of their birthday each month.
  • Perhaps they had a bad experience with an unprofessional clown at a birthday party.
  • Follow the link below to enter your name and birthday message.
  • We've prepared a special birthday menu of past posts to peruse.
  • Combine this with with occasional live music and plant sales, and you have a birthday bash to remember.
  • Today, a great geek, literary and comic book icon celebrates a birthday.
  • Over the years his birthday gifts have sent him parasailing, on hot air balloons rides, and zip-lining through canyons.
  • As many as seven in ten won't live to see their fourth birthday.
  • We may be celebrating a birthday or having a little dinner party.
British Dictionary definitions for birthday


  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
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Word Origin and History for birthday

late 14c., from Old English byrddæg, "anniversary celebration of someone's birth" (at first usually a king or saint); see birth (n.) + day. Meaning "day on which one is born" is from 1570s. Birthnight is attested from 1620s.

Online Etymology Dictionary, © 2010 Douglas Harper
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