Dictionary

trimester

noun tri·mes·ter \(ˌ)trī-ˈmes-tər, ˈtrī-ˌ\

: 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
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Examples of TRIMESTER

  1. 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
Medical Dictionary

trimester

noun tri·mes·ter \(ˈ)trī-ˈmes-tər, ˈtrī-ˌ\

Medical Definition of TRIMESTER

:  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

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