WordWeb Online

1. A period marked by distinctive character or reckoned from a fixed point or event
   - epoch
    
2. A major division of geological time; an era is usually divided into two or more periods
   - geological era

1. (baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched
   - earned run average

Derived forms: eras

Type of: criterion, geologic time, geological time, measure, period, period of time, standard, time period, time span, touchstone

Part of: aeon, eon

Encyclopedia: Era, TX