subperiod
/ˈsʌbˌpɪriəd/
noun
- A smaller division of time within a larger period.
- The project timeline includes a subperiod for testing before the final launch.
- In history class, we studied the subperiod known as the Renaissance within the larger Middle Ages.
- The Mesozoic era is divided into three subperiods: Triassic, Jurassic, and Cretaceous.