#opposition.direction  a direction opposite to another
  supertype:  #direction  the spatial relation between something and the course along which it points or moves; "he checked the direction and velocity of the wind"
  subtype:  #orthogonal_opposition__orthogonality__perpendicularity  the relation of opposition between things at right angles
  subtype:  #antipodal_opposition__antipodalopposition__antipodal__diametrical_opposition__diametricalopposition  the relation of opposition along a diameter
  subtype:  #enantiomorphism__mirror-image_relation  the relation of opposition between crystals or molecules that are reflections of one another

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