adjective, noun, plural bi·cen·ten·ar·ies. Chiefly British.

  1. bicentennial.


  1. marking a 200th anniversary
  2. occurring every 200 years
  3. lasting 200 years

noun plural -naries

  1. a 200th anniversary

“pertaining to a 200-year period,” 1843; see bi- + centenary. Also see bicentennial. As a noun, “a bicentennial anniversary or celebration,” also from 1843.

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