CENTENNIAL

Cen‐ten″ni‐al (?), a. [[L. centum a hundred + annus year.]] 1. 1. Relating to, or associated with, the commemoration of an event that happened a hundred years before; as, a centennial ode.
2. 2. Happening once in a hundred years; as, centennial jubilee; a centennial celebration.
3. 3. Lasting or aged a hundred years.
That opened through long lines Of sacred ilex and centennial pines. Longfellow.