bi·cen·ten·ni·al 
/ˌbaɪsɛnˈtɛnijəl/ noun
plural bi·cen·ten·ni·als /ˌbaɪsɛnˈtɛnijəl/ noun [count] US : a 200th anniversary or its celebration
▪ The United States celebrated its bicentennial [=(Brit) bicentenary] in 1976. [=celebrated the fact that it was 200 years old] ▪ Next year is the bicentennial of the school's founding [=the year 200 years after the school was started] — compare centennial
▪ The United States celebrated its bicentennial [=(Brit) bicentenary] in 1976. [=celebrated the fact that it was 200 years old] ▪ Next year is the bicentennial of the school's founding [=the year 200 years after the school was started] — compare centennial
— bicentennial adjective always used before a noun
▪ a bicentennial [=(Brit) bicentenary] celebration/year
▪ a bicentennial [=(Brit) bicentenary] celebration/year
