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14th century, in the meaning defined at sense 1
Middle English posterne, from Anglo-French, alteration of Old French posterle, from Late Latin posterula, diminutive of postera back door, from Latin, feminine of posterus
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“Postern.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/postern. Accessed 12 December 2019.
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a period of high artistic development
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