illumine UK /ɪˈl(j)uːmɪn/US /ɪˈlumən/verb 11forms 6 verb11 •To become bright; to light up. •(literary) To shine light on (something).Last night of al, when yonder starre that's westward from the pole, had made his coarse to illumine that part of heauen. Where now it burnes, Marcellus and myself, The bell then towling one. — 1599 •(literary) To cause (something) to glow or shine with light.And as the bright sun glorifies the sky, / So is her face illumined with her eye; […] — 1593 •Synonym of illuminate. •(figurative, rare) To enlighten (someone) intellectually.What in me is dark / Illumine, what is low raise and support; / That to the highth of this great Argument / I may assert th' Eternal Providence, / And justifie the wayes of God to men. — 1667 •(figurative) To enlighten intellectually. •(literary, figurative) To cause (a person or their face) to show enlightenment, happiness, etc. •(figurative) Of a person or their face: to show enlightenment, happiness, etc."Shell-shock." Our faces did not illumine so she dragged on lamely, "Anyway, he's not well." — 1918 •(literary, figurative) To enlighten (someone) spiritually; to induce (someone) to adopt, or believe in the truth of, a religion, religious tenet, etc.Be perfect as your Father in Heaven is perfect, didst thou call to me, my holy and divine teacher, thou Jesus Christ, who illuminedst the spirit world with a light, which was not of this world; […] — 1840 •(literary) To decorate (a page of a manuscript book) with ornamental designs.To Cato, Virgil pay'd one honest line; / O let my Country's Friends illumin mine! — 1738 •(literary, figurative) To cause (the eyes) to see. formsillumined · illuminedst · illumining · illumines · illumineth · illuminest