[ˏtraisen'tinәri]
adj.
三百年的,三百周年纪念的

[ adj ]
of or relating to or completing a period of 300 years
<adj.pert>

Tricentenary \Tri*cen"te*na*ry\, a. [Pref. tri- + centenary.]
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.