Centennial

Part of speech: noun (n.)

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

Part of speech: adjective (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. Thet opened through long lines Of sacred ilex and centennial pines. Longfellow.