n.
Pronunciation: ( ˌ )tr ī - ' mes-t ə r, ' tr ī - ˌ
Function: noun
Etymology: French trimestre, from Latin trimestris of three months, from tri- + mensis month ― more at MOON
Date: 1821
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