era era /ˈɪrə/

noun

1. () A period marked by distinctive character or reckoned from a fixed point or event  ( epoch , era )
   a period marked by distinctive character or reckoned from a fixed point or event
     The invention of the internet marked a new epoch in human history.
   The invention of the internet marked a new epoch in human history.
   
2. A major division of geological time; an era is usually divided into two or more periods  ( era , geological era )
   a major division of geological time; an era is usually divided into two or more periods
   

 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 , ERA )
   (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