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 series or flight of steps; a staircase. Often used in the plural.

n. One of a flight of steps.

n. A single step in a staircase.

n. A series of steps, a staircase.

n. One step of a series for ascending or descending to a different level; -- commonly applied to those within a building.

n. A series of steps, as for passing from one story of a house to another; -- commonly used in the plural; but originally used in the singular only.

n. A step; a degree.

n. One of a series of steps to mount by: as, a flight of stairs.

n. A flight or succession of flights of steps, arranged one behind and above the other in such a way as to afford passage from a lower to a higher level, or vice versa: as, a winding stair; the back stair: often used in the plural in the same sense.

n. support consisting of a place to rest the foot while ascending or descending a stairway

"Each stair is illuminated by a three beam spotlight and all the wires are intelligently hidden."

support   

spiral stairs    geometrical stairs    close-string stairs    pair of stairs    down stairs    flight of stairs    up stairs    hanging stairs    below stairs    schroeder's stair figure   

crowstep    corbiestep    corbel step   

flight    grece    staircase    stairway    winder    companionway    escalator   

Adair    Aer    Altair    Astaire    Ayre    Baer    Bear    Blair    Cher    Clair   

staircase    corridor    step    floor    doorway    hall    porch    tunnel    balcony    ladder