#interval.distance__separation  the distance between things; "fragile items require separation and cushioning"
  supertype:  #distance  the property created by the space between two objects or points
  subtype:  #clearance.interval  the distance by which one thing clears another; the space between them
  subtype:  #divergence  degree of spatial separation

No statement uses or specializes #interval.distance; click here to add one.