Trimester (noun)

A period of three months, especially in reference to pregnancy, where the duration of pregnancy is divided into three parts.

Origin:

From latin tri- ("three") + -mester, from mensis ("month"), from mensis ("moon"). .

Examples:

1. The first trimester of pregnancy is considered to be the most critical.
2. The second trimester is often referred to as the "golden period" of pregnancy.
3. The third trimester is the final stage of pregnancy, as the baby prepares for birth.
4. The trimesters of pregnancy are used as a way of measuring fetal development.
5. A trimester system of education is a system where the academic year is divided into three terms.