noun
trimester
TRIH-mehs-tuh
noun
1
A period of about three months, especially one of the three stages of pregnancy.
"She felt much better by the second trimester."
2
One of three terms making up an academic year.
"The college splits its year into three trimesters instead of two semesters."
How to Use Trimester
Learner’s notesIn plain EnglishA three-month stretch of time — most often used for stages of pregnancy or school terms.
Easily confused with
Word Forms
trimesters plural
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She felt much better by the second _____.
Etymology
From Latin trimestris ("of three months"), from tres ("three") and mensis ("month").