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trimester (n.)

1821, "period of three months," from French trimestre (early 17c.), from Latin trimestris "of three months," from tri- "three" (see tri-) + mensis "month" (see moon (n.)). Specific obstetrics sense is attested from 1900. Related: Trimestrial.

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Definitions of trimester from WordNet

trimester (n.)
a period of three months; especially one of the three three-month periods into which human pregnancy is divided;
trimester (n.)
one of three divisions of an academic year;
From wordnet.princeton.edu