DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   era
       n 1: a period marked by distinctive character or reckoned from a
            fixed point or event [syn: era, epoch]
       2: a major division of geological time; an era is usually
          divided into two or more periods [syn: era, geological
    era]
       3: (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 [syn: earned run average,
          ERA]