What does ER mean?

Looking for the meaning or definition of the word ER? Here's what it means.

Abbreviation
  1. Abbreviation of Elizabeth Regina. (Queen Elizabeth)
  2. (physics) Abbreviation of Einstein-Rosen bridge.
Proper noun
  1. (sports) Abbreviation of Erie. (Erie, Pennsylvania, USA)
Initialism
  1. (baseball) The statistic "Earned Run" (a run that was scored without the aid of an error by the fielding team that is charged to the pitcher responsible for allowing the runner that scored to reach base.)
  2. (biology) Initialism of Endoplasmic Reticulum.
  3. (computing) Initialism of Entity-Relationship.
  4. (medicine) Initialism of emergency room.
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