1. one of a series of steps for going from one level to another
2. a series or flight of steps; a staircase
Usage: often plural

Examples

• She tripped on the bottom stair.
• The wooden stair creaked under his weight.
• He climbed the stairs to the second floor.
• The spiral stair led to the tower room.
• Each stair was covered with a red carpet.
• The old house had narrow stairs.
• She sat on the top stair waiting for her friend.