noun
: the average number of earned runs per game scored off a pitcher determined by dividing the total of earned runs scored against him by the total number of innings pitched and multiplying by nine
noun
: the average number of earned runs per game scored off a pitcher determined by dividing the total of earned runs scored against him by the total number of innings pitched and multiplying by nine
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012