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trimester

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trimester/traɪˈmɛstɚ/noun
pluraltrimesters
trimester
/traɪˈmɛstɚ/
noun
pluraltrimesters
Learner's definition of TRIMESTER  
[count]
: a period of three months
especially  : one of three periods into which a woman's pregnancy is often divided
US  : one of three periods into which an academic year is sometimes divided
— compare quarter, semester, term
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