tricentenary Meaning, Definition & Usage

  1. adjective of or relating to or completing a period of 300 years
    tricentennial.

WordNet

Tri*cen"te*na*ry adjective
Etymology
Pref. tri- + centenary.
Definitions
  1. Including, or relating to, the interval of three hundred years; tercentenary. -- n. A period of three centuries, or three hundred years, also, the three-hundredth anniversary of any event; a tercentenary.

Webster 1913