Illuminate

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late Middle English: from Latin illuminat- ‘illuminated’, from the verb illuminare, from in- ‘upon’ + lumen, lumin- ‘light’.

wiktionary

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From Middle English illuminaten, borrowed from Latin illūminātum, supine of illūminō(“lighten, light up, show off”), from in + lūminō(“light up”), from lūmen(“light”). Cognate with Old English lȳman(“to glow, shine”). More at leam.

etymonline

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illuminate (v.)

c. 1500, "to light up, shine on," a back-formation from illumination or else from Latin illuminatus, past participle of illuminare "light up, make light, illuminate." Earlier was enlumyen (late 14c.) "decorate written material by hand with gold, silver, or bright colors," from Old French enluminer, from Late Latin inluminare; also illumine (late 14c.). Related: Illuminated; illuminating; illuminable.