Plural of staircase; sequences of steps with railings that allow you to walk from one level to another in a building.
Compound of 'stair' (from Old English 'stær') and 'case' (from Old French 'casse' meaning framework). The compound emerged in the 1500s to describe the complete structure rather than just individual steps.
Staircases are one of humanity's most important architectural inventions—they literally created vertical cities! The spiral staircase in particular is a mathematical marvel that cultures independently reinvented everywhere.
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