Etymology
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postern (n.)

c. 1300 (mid-13c. in surnames), "side door, small entranceway, private door," from Old French posterne "side or rear gate," earlier posterle, from Late Latin posterula (Medieval Latin posterna) "small back door or gate," diminutive of Latin posterus "that is behind, coming after, subsequent," from post "after" (see post-).

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Definitions of postern

postern (n.)
a small gate in the rear of a fort or castle;
From wordnet.princeton.edu