1. [n]  the 100th anniversary
2. [adj]  of or relating to or completing a period of 100 years; "centennial celebration"

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Centennial
The story of Colorado, from the time of pre-man until 1974.

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1. \Cen*ten"ni*al\, a. [L. centum a hundred + annus
   year.]
   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.                     --Longfellow.
   

2. \Cen*ten"ni*al\, n.
   The celebration of the hundredth anniversary of any event; a
   centenary. [U. S.]