a period of time marked by distinctive character, events, etc.: The use of steam for power marked the beginning of an era.
the period of time to which anything belongs or is to be assigned: She was born in the era of hansoms and gaslight.
a system of chronologic notation reckoned from a given date: The era of the Romans was based upon the time the city of Rome was founded.
a point of time from which succeeding years are numbered, as at the beginning of a system of chronology: Caesar died many years before our era.
a date or an event forming the beginning of any distinctive period: The year 1492 marks an era in world history.