Birthday

n.	1.	The day in which any person is born; day of origin or commencement. Those barbarous ages past, succeeded next The birthday of invention. - Cowper.
	2.	The day of the month in which a person was born, in whatever succeeding year it may recur; the anniversary of one's birth. This is my birthday; as this very day Was Cassius born. - Shak.
a.	1.	Of or pertaining to the day of birth, or its anniversary; as, birthday gifts or festivities.

Noun	1.	birthday - an anniversary of the day on which a person was born (or the celebration of it)
	2.	birthday - the date on which a person was born Synonyms: natal day

anniversary, annual holiday, bicentenary, bicentennial, biennial, bissextile day, centenary, centennial, commemoration, decennial, diamond jubilee, golden wedding anniversary, holy days, immovable feast, jubilee, leap year, name day, natal day, octennial, quadrennial, quasquicentennial, quincentenary, quincentennial, quinquennial, septennial, sesquicentennial, sextennial, silver wedding anniversary, tercentenary, tercentennial, tricennial, triennial, wedding anniversary