Dictionary
quad•ri•cen•ten•ni•al
Pronunciation: (kwod"ru-sen-ten'ē-ul), [key]—
adj.
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.