Definitions for earned run average
Random House Webster's College Dictionary
earned′ run′ av`erage(n.)
a figure used to indicate the effectiveness of a baseball pitcher, obtained by calculating the average number of earned runs scored against the pitcher for every nine innings pitched.
Ref: Abbr.: ERA 2 , era 2
Origin of earned run average:
earned run average(Noun)
a statistic in baseball which equals the number of earned runs allowed per nine innings pitched.
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