To make light; to throw light on; to supply with
light, literally or figuratively; to brighten.

To light up; to decorate with artificial lights, as
a building or city, in token of rejoicing or respect.

To adorn, as a book or page with borders, initial
letters, or miniature pictures in colors and gold, as was done in
manuscripts of the Middle Ages.

To make plain or clear; to dispel the obscurity to
by knowledge or reason; to explain; to elucidate; as, to illuminate a
text, a problem, or a duty.

To light up in token or rejoicing.

Enlightened.

One who enlightened; esp., a pretender to extraordinary
light and knowledge.