era
/ˈɪrə/
noun
- A long period of time in history that is known for particular events, developments, or characteristics.
- The digital era has changed how we communicate.
- The Victorian era was a time of great industrial growth.
- Many people look back on the 1990s as a golden era for music.
- A major division of geological time, usually millions of years long.
- The Paleozoic era saw the first fish and amphibians.
- Dinosaurs lived during the Mesozoic era.
- Geologists study rock layers to understand each era of Earth's history.