RhymeZone: threshold definitions

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Definitions of threshold:

noun: the smallest detectable sensation
noun: the starting point for a new state or experience
Example: "On the threshold of manhood"
noun: a region marking a boundary
noun: 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
noun: the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close