[bahy-sen-ten-ee-uh l]
  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.
Also especially British, bicentenary.

Origin of bicentennial

First recorded in 1880–85; bi-1 + centennial
Related formsbi·cen·ten·ni·al·ly, adverb

Usage note

See bi-1. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for bicentennial

Contemporary Examples of bicentennial

Historical Examples of bicentennial

Word Origin and History for bicentennial

also bi-centennial, 1843 (adj.), 1871 (noun), American English, from bi- + centennial (q.v.). In rivalry with bicentenary (1831) which seems to have been the more common word in Britain.

Online Etymology Dictionary, © 2010 Douglas Harper