noun.
The anniversary of the day on which something is created.
noun.
The date on which someone is born or something is created, more commonly called birthdate or date of birth.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the date on which a person was born
noun.
an anniversary of the day on which a person was born (or the celebration of it)
Word Usage
"Promoted to Headline (H2) on 6/20/08: Another 'unhappy birthday' for Aung San Suu Kyi yahooBuzzArticleHeadline = 'Another \'unhappy birthday\' for Aung San Suu Kyi '; yahooBuzzArticleSummary =' Article: Remarks on Aung San Suu Kyi\'s birthday and comments on the opposition\'s activities of Burma. '"