Simple Definition of trimester
: a period of three months; especially : one of three periods into which a woman's pregnancy is often divided
: one of three periods into which an academic year is sometimes divided
Full Definition of trimester
1 : a period of three or about three months; especially : any of three periods of approximately three months each into which a human pregnancy is divided
2 : one of three terms into which the academic year is sometimes divided
Examples of trimester in a sentence
development in the first trimester
Origin of trimester
French trimestre, from Latin trimestris of three months, from tri- + mensis month — more at moon
First Known Use: 1821
Learn More about trimester
Medical Dictionary: Definition of "trimester"
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