The term "trimester of pregnancy" refers to the three distinct stages of fetal development during a pregnancy. While this term is commonly used in medical contexts, there are several synonyms that can be used to describe each trimester. For example, the first trimester can be referred to as the "early pregnancy period" or the "initial trimester." The second trimester can be called the "mid-pregnancy stage" or the "growth trimester," while the third trimester can be referred to as the "late pregnancy period" or the "final trimester." Synonyms for the term "trimester of pregnancy" can help provide a clearer picture of fetal development over the course of a pregnancy.