What is the meaning of the word "earned run average"?

Definitions:

  1. A statistical measure used in baseball to evalueate a pitcher's effectiveness, that represents the average number of earned runs allowed by a pitcher per nine innings pitched. copy to clipboard NOUN
    • With an ERA of 2.85, the pitcher is having an outstanding season. copy to clipboard
  2. Measures how many earned runs a pitcher allows on average over a standard game of nine innings. copy to clipboard NOUN
    • His Earned Run Average increased after giving up five runs in last night's game. copy to clipboard

Synonyms: