simple past tense and past participle of illuminate
"The candles illuminated the dark room, casting a warm glow on our faces as we celebrated."
In plain English: To illuminate something means to light it up so you can see it clearly.
"The candles illuminated her face with a soft, warm glow."
provided with artificial light
"illuminated advertising"
"looked up at the lighted windows"
"a brightly lit room"
"a well-lighted stairwell"
irradiated by light, lit
"The ancient manuscript was illuminated by a single candle on the dark desk."