1. A period marked by distinctive character or reckoned from a fixed point or event (synset 115273375)
  2. A major division of geological time;
    An era is usually divided into two or more periods (synset 115272831)
  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 (synset 107275968)

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