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Synonyms
e·ra (îŕə, ĕŕə)

[Late Latin aera, from Latin, counters, pl. of aes, aer-, bronze coin.]

noun 

  1. A period of time as reckoned from a specific date serving as the basis of its chronological system.
    1. A period of time characterized by particular circumstances, events, or personages: the Colonial era of U.S. history; the Reagan era.
    2. A point that marks the beginning of such a period of time. See synonyms at period
  3. The longest division of geologic time, made up of one or more periods.
ERA

abbreviation 

  1. earned run average
  2. Equal Rights Amendment
earned run average

noun 

Baseball
A measure of a pitcher's performance obtained by dividing the total of earned runs allowed by the total of innings pitched and multiplying by nine.