1. the action of lighting something or the state of being lit up
2. understanding or insight, especially of a spiritual or intellectual nature
3. decorative lighting or colored lights used for celebration

Examples

• The illumination from the streetlights made the park feel safer at night.
• The sudden illumination of the stage revealed the entire cast.
• Reading that book provided great illumination on the subject.
• The festival featured beautiful illuminations throughout the town square.
• Medieval manuscripts are famous for their intricate illumination.
• The lighthouse’s illumination could be seen for miles.
• His explanation brought illumination to the complex problem.