(~s, illuminating, ~d)
1.
To ~ something means to shine light on it and to make it brighter and more visible. (FORMAL)
No streetlights ~d the street...
VERB: V n
2.
If you ~ something that is unclear or difficult to understand, you make it clearer by explaining it carefully or giving information about it. (FORMAL)
They use games and drawings to ~ their subject.
VERB: V n
illuminating
His autobiography provides an illuminating insight into his mind.
ADJ: oft it v-link ADJ to-inf