earned run average

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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

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His boss, whom he admires, is waiting to meet with him about the big project.

His boss, who he admires, is waiting to meet with him about the big project.

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Origin of earned run average

First recorded in 1945–50

Words nearby earned run average

ear-minded, earmuff, earn, earned income, earned run, earned run average, earner, earnest, earnestly, earnest money, earnestness