From Longman Dictionary of Contemporary Englishbicentenarybi‧cen‧te‧na‧ry /ˌbaɪsenˈtiːnəri $ -ˈtenəri, -ˈsentəneri/ noun (plural bicentenaries) [countable] especially British EnglishTMC the day or year exactly 200 years after an important event → centenarybicentenary of the bicentenary of Mozart’s death —bicentenary adjective [only before noun]
Examples from the Corpus
bicentenary• But there is one part of the Region which claims 1993 as its bicentenary.• It was the bicentenary of the discovery of the first asteroid.• Lyte - whose bicentenary it is on 1st June, this year - was also a fanatical bookman. 