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bicentenary (adj.)

"pertaining to a 200-year period," 1843; see bi- + centenary. Also see bicentennial. As a noun, "two-hundredth anniversary or celebration," from 1840.

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