<p><strong>Adjective:</strong></p><ul><li>Pertaining to or in honor of a 200th anniversary: bicentennial celebration; a bicentennial exposition.</li><li>Consisting of or lasting 200 years: a bicentennial period.</li><li>Occurring every 200 years: the bicentennial return of a comet.</li></ul><p><strong>Noun:</strong></p><ul><li>A 200th anniversary: The United States had its bicentennial in 1976.</li><li>A celebration of such an anniversary.</li></ul>