Definitions from Wiktionary (postern)

▸ noun:  A back gate, back door, side entrance, or other gateway distinct from the main entrance.
▸ noun:  (archaic) By extension, a separate or hidden way in or out of a place, situation etc.
▸ noun:  (historical, military) A subterranean passage communicating between the parade and the main ditch, or between the ditches and the interior of the outworks.
▸ adjective:  Situated at the rear; posterior.

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