illumination

Short definition from Wiktionary

Noun

1. 1
   The act of illuminating, or supplying with light; the state of being illuminated.
2. 2
   Festive decoration of houses or buildings with lights.
3. 3
   Adornment of books and manuscripts with colored illustrations. See illuminate (transitive verb).
4. 4
   Splendour; brightness.
5. 5
   Enlightening influence; inspiration.