Centennial /(?)/

Cen·ten·ni·al

Centennial

a.
  1. Relating to, or associated with, the commemoration of an event that happened a hundred years before; as, a centennial ode.
  2. Happening once in a hundred years; as, centennial jubilee; a centennial celebration.
  3. Lasting or aged a hundred years.
    That opened through long lines Of sacred ilex and centennial pines.

Centennial

n.
  1. The celebration of the hundredth anniversary of any event; a centenary. [U. S.]