/ ɪˌluːmɪˈneɪʃn; NAmE / noun
1.
[ U , C ] light or a place that light comes from :
The only illumination in the room came from the fire.
2.
illuminations [ pl. ] ( BrE ) bright coloured lights used to decorate a town or building for a special occasion :
Christmas illuminations
3.
[ C , usually pl. ] a coloured decoration, usually painted by hand, in an old book
4.
[ U ] ( formal ) understanding or explanation of sth :
spiritual illumination
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WORD ORIGIN
Middle English : via Old French from late Latin illuminatio(n-) , from the verb illuminare , from in- upon + lumen , lumin- light.