1. lighting up or brightening with light
Usage: archaic or poetic form
2. making clear or understandable; enlightening
Usage: archaic or poetic form

Examples

• The dawn was illuming the eastern sky with golden light.
• Her wisdom was illuming the minds of her students.
• The candles were illuming the dark chamber.
• His teachings were illuming the path to understanding.
• The lighthouse was illuming the rocky coastline.
• The scholar’s work was illuming ancient mysteries.