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bicentennial (adj.)

also bi-centennial, "occurring every two-hundred years," 1843, American English; see bi- + centennial (q.v.). In rivalry with bicentenary (1840) which seems to have been the more common word in Britain. From 1871 as a noun, "the two-hundredth anniversary of an event."

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Definitions of bicentennial from WordNet
1
bicentennial (n.)
the 200th anniversary (or the celebration of it);
Synonyms: bicentenary
2
bicentennial (adj.)
of or relating to or completing a period of 200 years;
bicentennial celebration
Synonyms: bicentenary
From wordnet.princeton.edu