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ERA (countable and uncountable, plural ERAs)

  1. (astrometry) Initialism of Earth rotation angle (the rotation of the Earth from the Celestial Intermediate Origin that has no instantaneous motion along the equator.)
  2. (baseball) Initialism of earned run average, a baseball statistic.
  3. (electronics) Initialism of electrically reconfigurable array.
  4. (military) Initialism of explosive reactive armor.
  5. (UK, military) Initialism of engine room artificer., a Royal Navy position

Proper noun[edit]


  1. (European Union, railways) Initialism of European Railway Agency (called today the European Union Agency for Railways)
  2. (US) Initialism of Equal Rights Amendment.

Further reading[edit]