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Meaning of piano nobile*

pia•no no•bi•le

Pronunciation: (pyä'nô nô'bē-le), [key]
— pl. pia•ni no•bi•li
  1. the principal story of a large building, as of a palace or villa.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.