the principal floor of a large house, with higher ceilings than the ground floor/basement or floor(s) above, and containing the main reception rooms. Based on Italian Renaissance ideas, and meaning ìnoble floor.

In a classical house the first and principal floor containing the main suite of rooms.

An Italian term designating the first floor of a domestic building (generally above workshops or arcades on the ground floor). Characterised by larger windows and richer ornament.

the main floor of a house, especially a palazzo, containing reception rooms. It is usually higher than the other floors, with the basement or ground floor below and one or more shallower stories above.

The main floor of a palazzo (sometimes the second floor).

The piano nobile is the principal floor of a large house, usually built in one of the styles of classical renaissance architecture. This floor contains the principal reception and bedrooms of the house.