Definitions for "Earned run"
Keywords:  pitcher, catcher, error, scored, scorer
a run that was not scored as the result of an error by the other team
a run for which the pitcher is held accountable, and shall be charged every time a runner reaches home base unless an error (including catcher's interference) or passed ball occurs that leads to that run
a run that is ruled by the official scorer to have resulted exclusively from actions by the batting team and not because of errors by the defense