Trimester or Trimestre may refer to: *

Academic term An academic term (or simply term) is a portion of an academic year, the time during which an educational institution holds classes. The schedules adopted vary widely. In most countries, the academic year begins in late summer or early autumn and ...

, a trimester system divides the academic year into three terms * Trimester (pregnancy) in humans, where the time of pregnancy is divided into three terms of 13 weeks to refer to the fetus's development * A period of three months (''Latin tri +mensis=month or moon)'' In Europe, where financial years start on 1 January each year, often Jan+Feb+Mar etc.

See also