Centennial

1. n. The celebration of the hundredth anniversary of any event; a centenary.
2. a. Relating to, or associated with, the commemoration of an event that happened a hundred years before; as, a centennial ode.
3. a. Happening once in a hundred years; as, centennial jubilee; a centennial celebration.
4. a. Lasting or aged a hundred years.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.