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trimester

noun
🔊/traɪˈmestə(r)/
🔊/traɪˈmestər/
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  1. (medical医学) a period of three months during the time when a woman is pregnant妊娠期（以三个月为单位）
    • the first trimester of pregnancy妊娠的头三个月
    Topics Timec2, Life stagesc2
  2. (North American English)
    (also term especially in British English)
    one of the three periods in the year during which classes are held in schools, universities, etc.妊娠期（以三个月为单位）
    • The school year is divided into three trimesters.一学年分三个学期。🔊🔊
    compare semester
    3. Word Originearly 19th cent.: from French trimestre, from Latin trimestris, from tri- ‘three’ + mensis ‘month’.