Find the word definition

The Collaborative International Dictionary
Trimestrial

Trimestrial \Tri*mes"tri*al\, a. Of or pertaining to a trimester, or period of three months; occurring once in every three months; quarterly.

Wiktionary
trimestrial

a. 1 Of or pertaining to a trimester, or period of three months. 2 Occurring once every three months; quarterly.