#length.distance  the linear extent in space from one end to the other; the longest horizontal dimension of something that is fixed in place; "the length of the table was 5 feet"
  supertype:  #fundamental_quantity  #physical_property  #dimension  #distance (pm)
  subtype:  #circumference  the length of the closed curve of a circle
  subtype:  #diameter__diam  the length of a straight line passing through the center of a circle and connecting two points on the circumference
     subtype:  #bore__caliber__calibre  diameter of a tube or gun barrel
     subtype:  #windage  bore-to-projectile difference in diameter
  subtype:  #radius__r  the length of a line segment between the center and circumference of a circle or sphere
     subtype:  #semidiameter  the apparent radius of a celestial body when viewed as a disc from the earth
     subtype:  #radius_of_curvature  the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point
  subtype:  #longness.length  spatial extent
     subtype:  #lengthiness__lengthines__prolongation  amount or degree or range to which something extends: "the wire has an extension of 50 feet"
     subtype:  #elongation.longness  the quality of being elongated
  subtype:  #shortness__shortnes  the property of being of short spatial extent
  subtype:  #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"
     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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