#dark__darkness  absence of light or illumination
  exclusion:  light.illumination
  supertype:  illumination  the degree of visibility of your environment
  subtype:  night.dark  darkness; "it vanished into the night"
  subtype:  total_darkness__lightlessness__lightlessnes__blacknes__pitchblacknes__black  total absence of light; "they fumbled around in total darkness"; "in the black of night"
  subtype:  brownout__blackout__dimout  darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
  subtype:  semidarkness  partial darkness
     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

No statement uses or specializes dark; click here to add one.