superstructure - definition and synonyms

noun 

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/ˈsuːpə(r)ˌstrʌktʃə(r)/
singularsuperstructure
pluralsuperstructures
  1. 1
    [countable] the part of a ship that is above the main deck
    1. a.
      the part of a building that is above its foundations (=the parts below ground)
  2. 2
    [singular] formal an idea or social system that has developed from a more basic idea or system