Baseball A measure of a pitcher's performance obtained by dividing the total of earned runs allowed by the total of innings pitched and multiplying by nine.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "earned run average" in a sentence
"And the prospects for that scenario looked promising: The Phillies Game 4 starter, Joe Blanton, owned a earned run average of over eight against the Bombers."