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stair A stair is one step in a staircase. A staircase is a set of steps that people use to go upstairs or downstairs in a building. Sometimes the word "stair" can also mean a "staircase."
step a raised surface to place the foot on when going up or down; stair. [1/8 definitions]
tread a surface on which one steps, such as the horizontal surface of a stair. [1/7 definitions]