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[n] the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offer support when passing through a doorway
[n] the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; "he stuck his head in the doorway"
[n] the smallest detectable sensation
[n] a region marking a boundary
[n] the starting point for a new state or experience; "on the threshold of manhood"

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