tri•cen•ten•ni•alPronunciation: (trī"sen-ten'ē-ul), [key]
pertaining to 300 years or a period of 300 years.
marking the completion of such a period: a tricentennial celebration.
a 300th anniversary or its celebration. Also,tercentenary,tercentennial.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.