illuminatev. t.[L. illuminatus, p. p. of illuminare; pref. il- in + luminare to enlighten, fr. lumen light. See Luminous, and cf. 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.()()v. i. To light up in token or rejoicing.()a.[L. illuminatus, p. p.] Enlightened.(Bp. Hall.)n. One who is enlightened; esp., a pretender to extraordinary light and knowledge.()