WordReference Random House Unabridged Dictionary of American English © 2026
earned′ run′ av′erage, [Baseball.]
  1. Sporta measure of the effectiveness of a pitcher, obtained by dividing the number of earned runs scored against the pitcher by the number of innings pitched and multiplying the result by nine. A pitcher yielding three earned runs in nine innings has an earned run average of 3.00. Abbr.: ERA, era
  • 1945–50

'earned run average' also found in these entries (note: many are not synonyms or translations):
ERA - era

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