trimester
/traɪˈmestə(r)/noun
1- a period of three months, especially as a division of the duration of pregnancy（整个怀孕期的）三个月分段期; 历时三个月的一段时间。
1.1
- US each of the three terms in an academic year〈美〉（一学年三学期制中的）一学期。
派生词
trimestral
adjectivetrimestrial
adjective词源
early 19th cent.: from French trimestre, from Latin trimestris, from tri- 'three' + mensis 'month'.