noun

staircase

staircase, stairs

She walked up the grand staircase.

She walked up the grand staircase.

The house has a spiral staircase.

The house has a spiral staircase.

a/the staircase a set of stairs inside a building She walked up the grand staircase.

Synonyms: stairs, flight of stairs

A combination of 'stair' and 'case' (in the sense of a frame or structure).

Think of it as a 'case' that holds the 'stairs'. A staircase is the entire structure, including the steps, banisters, etc.

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