Trimester

noun
  1. A period of three months, especially as a division of the duration of pregnancy or the academic year. noun
    The first trimester of pregnancy is crucial for the development of the fetus.
    Many universities divide their academic year into trimesters.
  2. A term or period of three months, often used in financial or business contexts to denote a quarter of a year. noun
    The company's profits increased significantly in the last trimester.
    We will review our goals at the end of each trimester.