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Topic: BIRTH

Date: 1800-1900
Language: French
Origin: trimestre, from Latin trimestris, from tri- 'three' + mensis 'month'

trimester

noun
     
tri‧mes‧ter [countable]
1 American EnglishSE one of three periods of equal length that the school year is divided into [= term British English]
2MB one of the three-month periods of pregnancy
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