Meaning of bicentennial

bi•cen•ten•ni•al

1. pertaining to or in honor of a 200th anniversary: bicentennial celebration; a bicentennial exposition.
2. consisting of or lasting 200 years: a bicentennial period.
3. occurring every 200 years: the bicentennial return of a comet.

1. a 200th anniversary: The United States had its bicentennial in 1976.
2. a celebration of such an anniversary.