From non- + illumination. <span class="searchmatch">nonillumination</span> (uncountable) Absence of illumination. 2015, Chris Calori, David Vanden-Eynden, Signage and Wayfinding Design...
illumination illuminationism illuminationist illumination problem <span class="searchmatch">nonillumination</span> oblique illumination overillumination over-illumination Phong illumination...