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one of the three academic periods within a year during which multiple classes are conducted in educational institutions, such as schools or universities
American
one of the three roughly three-month periods, each marking different stages of fetal development and maternal changes
What is a "trimester"?
A trimester is a period of roughly three months in a pregnancy, dividing the pregnancy into three stages. The first trimester covers weeks 1 to 12 and is when the baby’s major organs and structures begin to form. The second trimester lasts from weeks 13 to 26 and is marked by significant growth and development of the baby, along with noticeable changes in the mother’s body. The third trimester includes weeks 27 to birth, during which the baby continues to grow and mature, and the mother prepares for labor and delivery. Each trimester marks different stages of the baby's development and changes in the mother's body.
