This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A flight or series of flights of steps and a supporting structure connecting separate levels. Also called stairway.

n. a flight of stairs; a stairway

n. a connected set of flights of stairs; a stairwell

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

n. 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.

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

"At the top of the staircase is a small landing that separates two bedrooms to the right and left."

way   

stair    corkscrew staircase   

moving staircase    emergency exit    fire escape    ghat    flight of steps    steps    backstairs    escalator    ramp    flight   

staircasing   

stairway    corridor    balcony    pillar    doorway    porch    gallery    tunnel    hall    archway