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Online Medical Dictionary and glossary with medical definitions ... Trimester: The nine months of pregnancy is traditionally divided into three trimesters: distinct periods of ...

During the second trimester, the development of the foetus can be more easily monitored and diagnosed. The beginning of the third trimester often approximates the point of ...

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Definition from Wiktionary, a free dictionary

trimester n. A period or term of three months. One of three terms into which an academic year is divided in some universities and colleges

tri·mes·ter   (tr-m s t r, tr m s-) n. 1. A period or term of three months. 2. One of three terms into which an academic year is divided in some universities and colleges.