staircase

A flight or series of flights of steps and a supporting structure connecting separate levels.

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.

A flight of stairs with their supporting framework, casing, balusters, etc.

Any species of Solarium, or perspective shell.

a flight of stairs; a stairway

a connected set of flights of stairs; a stairwell

a way of access (upward and downward) consisting of a set of steps