#semidarkness  partial darkness
  supertype:  #dark__darkness  absence of light or illumination
  subtype:  #cloudiness__overcast  gloomy semidarkness caused by cloud cover
  subtype:  #dusk__twilight  a state of diffused or dim illumination
  subtype:  #shadiness__shadines__shadowiness__shadowines  relative darkness caused by light rays being intercepted by an opaque body
     subtype:  #shadow  shade within clear boundaries
        subtype:  #umbra  a region of complete shadow resulting from total obstruction of light
        subtype:  #penumbra  a fringe region of partial shadow around an umbra
  subtype:  #duskiness__duskines__dimnes  the state of being poorly illuminated
  subtype:  #sombreness__gloom__somberness  a state of partial or total darkness; "he struck a match to dispell the gloom"
  subtype:  #obscurity.semidarkness__obscureness  the state of being indistinct or indefinite for lack of adequate illumination

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