#depth  extent downward or backward or inward: "the depth of the water"; "depth of a shelf"; "depth of a closet"
  supertype:  #extent  the distance over which something extends
  subtype:  #profoundness__deepness__profundity  the quality of being physically deep: "the profundity of the mine was almost a mile"
     subtype:  #bottomlessness  the property of being very deep; without limit
  subtype:  #draught__draft  the depth of a vessel's keel below the surface (especially when loaded)
  subtype:  #sounding.depth  a measure of the depth of water taken by sounding
  subtype:  #shallowness__shallownes  the quality of lacking physical depth: "take into account the shallowness at that end of the pool before you dive"
     subtype:  #superficiality  shallowness in terms of affecting only surface layers of something: "he ignored the wound because of its superficiality"

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