stairs · noun plural /sterz/
stairs
A2 a set of steps which lead from one level of a building to another
Dictionary examples:
Go up the stairs and her office is on the right.
He stood at the foot of the stairs and called out, "Breakfast's ready!"
Learner example:
I have left my backpack in your house. I think it is near the stairs. (Key English Test; A2; Spanish)
a flight of stairs
C2 a set of stairs connecting one floor to another in a building
Dictionary example:
The elevator was broken so we had to climb six flights of stairs.
Learner example:
He descended a long flight of stairs and reached a door. (Certificate of Proficiency in English; C2; Portuguese)