#oppositeness__opposition  the relation between opposed entities
  subtype:  #antipode  #antithesis  #conflict.oppositeness  #direct_contrast  #mutual_opposition  #gradable_opposition  #polarity  #ungradable_opposition  #contradictoriness  #negation  #contradiction  #contrary.oppositeness  #contrariety  #tertium_quid  #opposite  #inverse  #antagonism.oppositeness
  supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
     supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
        supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
           supertype:  pm#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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