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earned run average

noun, Baseball.
a 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.
Abbreviation: ERA, era.
Origin of earned run average
1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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