birth·day

[burth-dey]
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; Middle English; see birth, day

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Birthday is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
Collins
World English Dictionary
birthday (ˈbɜːθˌdeɪ) [Click for IPA pronunciation guide]
 
n
1.  a.  an anniversary of the day of one's birth
 b.  (as modifier): birthday present
2.  the day on which a person was born
3.  any anniversary

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

birthday
O.E. byrddæg, "anniversary celebration of someone's birth" (usually a king or saint at first), from birth + 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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Example sentences
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.
Cooper gave a red hat and a copy of the poem to a friend for her birthday.
Combine this with with occasional live music and plant sales, and you have a
  birthday bash to remember.
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