Webster's English Dictionary

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illumination

il.lu.mi.na.tion \il-.u:-m*-'na--sh*n\ n 1: the action of illuminating or 
   state of being illuminated : as  1a: spiritual or intellectual 
   enlightenment  1b1: a lighting up  1b2: the luminous flux per unit area on 
   an intercepting surface at any give n point 3: one of the decorative 
   features used in the art of illuminating or in dec orative lighting