#length__distance  size of the gap between two places; "the distance from New York to Chicago"; "he determined the length of the shortest line segment joining the two points"
  exclusion:  #width  #height  #circumference  #diameter  #surface_area  #volume  #thickness  #tenuity  #angle
  supertype:  menu#spatial_characteristic (menu)  #size  #length.distance (pm)
  subtype:  #leg.distance  (nautical) the distance traveled by a sailing vessel on a single tack
  subtype:  #arm's_length__arm'slength  a distance sufficient to exclude intimacy
  subtype:  #light_time__lighttime  distance measured in terms of the speed of light (or radio waves); "the light time from Jupiter to the sun is approximately 43 minutes"
  subtype:  #skip_distance  the shortest distance that permits radio signals (of a given frequency) to travel from the transmitter to the receiver by reflection from the ionosphere
  subtype:  #wingspan__wingspread  linear distance between the extremities of an airfoil
  subtype:  #wingspread  distance between the tips of the wings (as of a bird or insect) when fully extended
  subtype:  #altitude  the perpendicular distance from the base of a geometric figure to opposite vertex (or side if parallel)

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