noun.
A flight or series of flights of steps and a supporting structure connecting separate levels.
The Century Dictionary and Cyclopedia
noun.
The part of a building which contains the stairs: also often used for stairs or flight of stairs. Staircases are straight or winding. The straight are technically called fliers or direct fliers.
the GNU version of the Collaborative International Dictionary of English
noun.
A flight of stairs with their supporting framework, casing, balusters, etc.
noun.
Any species of Solarium, or perspective shell.