trimester
noun [ C ] uk/trɪˈmes.tər/ /traɪˈmes.tər/ us/traɪˈmes.tɚ/ /ˈtraɪ.mes.tɚ/
三个月时间
a three-month period
（人类妊娠的）三月期
any of the three three-month periods that a human pregnancy is divided into
The second trimester is generally the easiest part of a pregnancy. 一般说来，第二个三月期是怀孕期间最轻松的一段时间。
US（一学年分为三学期的）一学期
any of the three-month periods into which the school or college year is sometimes divided
Many students arrange internships or work-study placements during the second trimester. 许多学生在第二学期安排实习或半工半读。
Compare: semester