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

: 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

: one of three terms into which the academic year is sometimes divided

See trimester defined for English-language learners

Origin of TRIMESTER

French trimestre, from Latin trimestris of three months, from tri- + mensis month — more at moon

First Known Use: 1821

Rhymes with TRIMESTER

arrester, attester, contester, detester, digester, infester, investor, Manchester, molester, northwester, requester, Rochester, semester, sequester, southwester, sou'wester, suggester

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