DictionarycentennialHundredth anniversary
noun / adjective

centennial

sen-TEN-ee-ul/senˈteniəl/

Marking or spanning one hundred years.

They celebrate the hall's centennial beside a cake marked one hundred.

An older woman and a middle-aged man celebrate a community hall’s hundredth anniversary beside a cake bearing the numeral 100 and a framed archival drawing of the same hall visible behind them.
Etymology

Centum supplies the hundred, while the ending modeled on biennial supplies the year-based interval. An adjective meaning lasting or recurring every hundred years became a noun for the hundredth-anniversary celebration.

In context

MooLer384:46
this is an interesting year for Disney it's their 100th it's a centennial
EFAP #229 - A complete breakdown of Jurassic Park with Robert Meyer Burnett

More examples

  • The town holds a centennial parade.
  • The museum opens a centennial exhibition.
  • Preparations for the college's centennial begin a year early.

Forms

centennial · centennials

Similar words

centenary
Another term for a hundredth anniversary, especially outside American English.
bicentennial
Marks two hundred years rather than one hundred.