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piano nobile

[pyah-naw naw-bee-le]
noun, plural pia·ni no·bi·li [pyah-nee naw-bee-lee] /ˈpyɑ ni ˈnɔ bi li/. Italian.
  1. the principal story of a large building, as of a palace or villa.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for piano nobile

piano nobile

noun
  1. architect the main floor of a large house, containing the reception rooms: usually of lofty proportions
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Word Origin

Italian: great floor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012