Era - Definition
era
n 1: a period marked by distinctive character or reckoned from a
fixed point or event [syn: era, epoch]
2: a major division of geological time; an era is usually
divided into two or more periods [syn: era, geological
era]
3: (baseball) a measure of a pitcher's effectiveness; calculated
as the average number of earned runs allowed by the pitcher
for every nine innings pitched [syn: earned run average,
ERA]