trimestral

Etymology
From.

Adjective

 * 1)  Of trimesters or the use thereof.
 * The school found that a trimestral system mitigated some of the problems caused by its high student turnover.

Usage notes

 * This adjective is disproportionately used by Spanish speakers, who use it to translate Spanish.

Adjective

 * 1) lasting three months
 * 2) occurring at intervals of about three months

Etymology
From.

Adjective

 * 1) trimonthly; quarterly occurring at intervals of three months