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Noun: trimester  trI'me-stu(r)
  1. A period of three months; especially one of the three three-month periods into which human pregnancy is divided
     
  2. One of three divisions of an academic year

Derived forms: trimesters

Type of: academic session, academic term, period, period of time, school term, session, time period

Part of: academic year, gestation, gestation period, school year

Encyclopedia: Trimester