Definition of trimester noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//traɪˈmestə(r)//
    ; NAmE NAmE//traɪˈmestər//
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  1. 1(medical) a period of three months during the time when a woman is pregnant the first trimester of pregnancy See related entries: Pregnancy
  2. 2(North American English) = term The school year is divided into three trimesters. compare semester
  3. Word Originearly 19th cent.: from French trimestre, from Latin trimestris, from tri- ‘three’ + mensis ‘month’.
See the Oxford Advanced American Dictionary entry: trimester

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