Webster's Revised Unabridged Dictionary · 1913

Illuminate

Illuminate , transitive verb

[Latin illuminatus, past participle of illuminare; pref. il- in + luminare to enlighten, from lumen light. See Luminous, and compare Illume, Illumine, Enlimn, Limn.]

1.
To make light; to throw light on; to supply with light, literally or figuratively; to brighten.
2.
To light up; to decorate with artificial lights, as a building or city, in token of rejoicing or respect.
3.
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.
4.
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.

Illuminate , intransitive verb

To light up in token or rejoicing.

Illuminate , adjective

[Latin illuminatus, p. p.]

Enlightened. — Bp. Hall

Illuminate , noun

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