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nounthe sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorwaytype of:part of:
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nounthe entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close
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nounthe smallest detectable sensation
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nouna region marking a boundary
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nounthe starting point for a new state or experience