Trimester or Trimestre may refer to:
Academic term, 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 The trimester framework in Roe v. Wade Semester Term (disambiguation)
