STAIR

[noun] [C] - one of the steps in a set of steps which lead from one level of a building to anotherThe top stair creaked as she went upstairs and the noise woke up her mother.He tripped on the stair carpet and fell down the stairs.(old use or literary) A stair can also mean a set of stairs.He climbed the wooden stair and knocked on his grandfather's door.I thought I could hear footsteps on the stair.