#grade  the gradient of a slope or road or other surface: "the road had a steep grade"
  subtype:  upgrade  downgrade
  supertype:  slope__grade  the property possessed by a line or surface that departs from the horizontal; "a five-degree grade"
     supertype:  spatial_relation__spatialrelation__position__spatial_property__spatialproperty  the spatial property of a place where or way in which something is situated; "the position of the hands on the clock"; "he specified the spatial relations of every piece of furniture on the stage"
        supertype:  relation  an abstraction belonging to or characteristic of two entities or parts together
           supertype:  thing_that_can_be_seen_as_a_relation  usable as relation type
              supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                 supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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