Meaning of quadricentennial

quad•ri•cen•ten•ni•al

Pronunciation: (kwod"ru-sen-ten'ē-ul), [key]
— adj.
  1. of, pertaining to, or marking the completion of a period of four hundred years.
—n.
  1. a quadricentennial anniversary.
  2. its celebration.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.