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1 Division between one storey and another. In the UK ground-, first-, second-, etc., described the storeys, but in many countries ‘first-floor’ means the ‘ground-floor’, etc.

2 Set of rooms and landings, on the same level, i.e. in one storey.

3 Layer of boards, etc., on which people tread, and i.e. the surface of the floor in the room.

Subjects: Architecture.

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