1. a set of steps leading from one floor of a building to another

Examples

• The grand staircase in the mansion was made of marble.
• She climbed the narrow staircase to the attic.
• The spiral staircase wound up to the tower room.
• Workers are installing a new staircase in the office building.
• The wooden staircase creaked under his weight.
• Emergency exits include the main staircase and fire escape.