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English definition of “trimester”

trimester

noun [C] uk   /trɪˈmes.tər/ /traɪ-/ us    /traɪˈmes.tɚ/
a three-month period 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. US 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.
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(Definition of trimester from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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