English edit

Etymology edit

non- +‎ illumination

Noun edit

nonillumination (uncountable)

  1. Absence of illumination.
    • 2015, Chris Calori, David Vanden-Eynden, Signage and Wayfinding Design, page 218:
      Nonillumination also makes sense if the site doesn't operate at night or if an overly commercial look is not desired.