threshold

Noun
  1. The starting point for a new state or experience (synset 115293950)
    "on the threshold of manhood"
  2. The smallest detectable sensation (synset 105720373)
  3. The entrance (the space in a wall) through which you enter or leave a room or building;
    The space that a door can close (synset 103228735)
    "he stuck his head in the doorway"
  4. The 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 doorway (synset 103228389)
  5. A region marking a boundary (synset 113926744)

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