#coordinate__co-ordinate  a number that identifies a position relative to an axis
  supertype:  #number  a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
  subtype:  #cartesian_coordinate__cartesiancoordinate  one of the coordinates in a system of coordinates that locates a point on a plane or in space by its distance from two lines or three planes respectively; the two lines or the intersections of the three planes are the coordinate axes
     subtype:  #dimension.cartesian_coordinate  one of three cartesian coordinates that determine a position in space
     subtype:  #abscissa  the value of a coordinate on the horizontal axis
     subtype:  #ordinate  the value of a coordinate on the vertical axis
  subtype:  #polar_coordinate__polarcoordinate  either of two values that locate a point on a plane by its distance from a fixed pole and its angle from a fixed line passing through the pole

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