stair
nounUK /steə/
US /ster/
A step you use to go up or down.
She climbed the stair to reach the top of the tower.
OTHER MEANINGS
2. A set of steps that connects different levels of a building.
He ran up the stairs to his room.
3. One of a series of steps in a staircase.
The bottom stair creaked under his foot.
4. A means of moving to a higher level or rank.
The promotion was the first stair on her career ladder.