A "trimester" is a term commonly used in education and healthcare to describe a period of three months. In schools, especially at the college level, the academic year is often divided into three trimesters, allowing students to take different courses throughout the year. This system can provide flexibility and a varied learning experience. In the context of pregnancy, a trimester refers to one of the three stages of gestation, each lasting about three months. The first trimester is crucial for fetal development, while the second and third trimesters focus on growth and preparation for birth. Understanding these trimesters helps expectant parents track the progress of their pregnancy.