trimester /traɪˈmɛstɚ/ noun plural trimesters
plural trimesters
Learner's definition of TRIMESTER
[count]
1
: a period of three months
especially : one of three periods into which a woman's pregnancy is often divided三个月的时间；（尤指妇女妊娠的）三月期 2
US : one of three periods into which an academic year is sometimes divided学期（一学年的三学期中的一个） — compare quarter, semester, term