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
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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