Definition of bicentennial noun from the Oxford Advanced American Dictionary

 

bicentennial

 noun
noun
NAmE//ˌbaɪsɛnˈtɛniəl//
 
(also bicentenary
NAmE//ˌbaɪsɛnˈtɛnəri//
 
)
 
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the year, or the day, when you celebrate an important event that happened exactly 200 years earlier The U.S. celebrated its bicentennial on July 4, 1976. to celebrate/mark the bicentennial ofMozart's birth
bicentennialadjective[only before noun]
 
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bicentennial celebrations