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 colourful 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 * In that flash of illumination, he realized where he had gone wrong.
