ERA
WordNet
noun
(1) (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
(2) A major division of geological time; an era is usually divided into two or more periods
(3) A period marked by distinctive character or reckoned from a fixed point or event
WiktionaryText
- “Earned Run Average” baseball statistic
- Equal Rights Amendment
- electrically reconfigurable array
- explosive reactive armor