Tercentenary
Pronunciation : Ter*cen"te*na*ry
Part of Speech : a.
Etymology : [L. ter thirce + E. centenary.]
Definition : Defn: Including, or relating to, an interval of three hundred years. -- n.
Defn: The three hundredth anniversary of any event; also, a celebration of such an anniversary.
Source : Webster's Unabridged Dictionary, 1913