What is the meaning of Illumination?

The act of illuminating, or supplying with light; the state of being illuminated.

Festive decoration of houses or buildings with lights.

Adornment of books and manuscripts with colored illustrations. See illuminate (transitive verb).

Splendour; brightness.

Enlightening influence; inspiration.

enlightenment (philosophy and psychology related to achieving clarity of perception, reason and knowledge)

illumination, lighting

Source: wiktionary.org