• A back gate, back door, side entrance, or other gateway distinct from the main entrance.
  • By extension, a separate or hidden way in or out of a place, situation etc.
  • A subterranean passage communicating between the parade and the main ditch, or between the ditches and the interior of the outworks.



  • From Old French posterne, alteration of posterle, from Late Latin posterula, from Latin posterus.

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