1. a long period of time marked by distinctive characteristics, events, or developments
2. a system of chronological notation reckoned from a given date

Examples

• The Victorian era lasted from 1837 to 1901.
• We are living in the digital era.
• The Mesozoic era is known as the age of dinosaurs.
• This marks the end of an era for our company.
• The Common Era begins with year 1 CE.
• The Renaissance era brought great cultural changes.
• Scientists study the Paleozoic era through fossils.