A set of steps, with or without a case, that allow one to walk up or down.

plural of staircase

plural of stairway

A shaft in a multi-story building enclosing a stairway or staircase.

A motorized platform installed in a stairway, which traverses the stairs when activated and can be ridden by those for whom the stairs are a barrier.

plural of stairlift

plural of stairwell

(rare, idiomatic) Thinking of an idea or course of action too late to use it effectively, or the tendency to do so.

plural of stairgate

A gate fitted across a domestic staircase to prevent young children from climbing the stairs, or falling down them.