i Register
In some senses, illuminate is marked as figuratively, obsolete, archaic. Watch for register when choosing this word.
ADV
brightly, clearly
dimly, faintly, softly
The old library was softly illuminated by candlelight during the evening ceremony.
briefly | suddenly
ADV
greatly, vividly
The documentary greatly illuminated how climate change affects communities in developing countries.
VERB + ILLUMINATE
help (to)
Recent discoveries about ancient civilizations help illuminate why people built those massive stone structures.