The series of steps that you walk up or down to go from one level to another.
Stairsteps are a common and useful part of buildings.
Examples:
She carefully walked down the stairsteps.
The cat sat on the stairsteps.
He ran up the stairsteps to catch the ball.
The stairsteps creaked as I walked on them.
The stairsteps in the old castle were very steep.
I counted the stairsteps as I went up.