say it: bahy-sen-TEN-ee-uhl
bicentennial is a noun and adjective meaning "the 200th anniversary (or the celebration of it)". It carries 2 recorded senses.
the 200th anniversary (or the celebration of it)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for bicentennial come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.