centenary
n. countable B2 Upper Intermediate US //ˈsɛntəˌnɛɹi// UK //sɛntˈiːnəɹi// cen·te·nary
n. the 100th anniversary of an event. You use this word to mark a date that is exactly one hundred years after something important happened.
n. the 100th anniversary of a particular event or date. More formal than 'centennial' in British English; often used in official commemorations.
The school celebrated its centenary last year.
The city held a large parade to mark the centenary of the local library opening.
The centenary of the treaty was marked by a series of diplomatic conferences aimed at strengthening international cooperation.