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birthday

[burth-dey] /ˈbɜrθˌdeɪ/
noun
1.
the anniversary of a birth.
2.
the day of a person's birth.
3.
a day marking or commemorating the origin, founding, or beginning of something.
4.
the festivities or celebration marking such a day or anniversary.
Origin
1350-1400
1350-1400; Middle English; see birth, day
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for birth day

birthday

/ˈbɜːθˌdeɪ/
noun
1.
  1. an anniversary of the day of one's birth
  2. (as modifier): birthday present
2.
the day on which a person was born
3.
any anniversary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for birth day

birthday

n.

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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