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illuminate (verb) brighten, fill with light; make a thing easily understood; decorate streets and buildings with lights.
The sun illuminates the world, that is, the sun fills the world with light. Our homes and other buildings are illuminated by electric lights. That is, electric lights fill them with light. You illuminate someone about something, if you make them understand it better or make it easy for them to understand it. 'The book illuminates a number of points about the game of chess.' This means the book makes it easy for us to understand a number of points about chess. Buildings and streets are illuminated on festive occasions, if they are decorated with rows of electric lights.
- The hall was very brightly illuminated by the high voltage lamps fixed in the four corners of the ceiling. Our eyes were dazzled by the illumination.
- The speech illuminated us on a number of points about the use of nuclear energy for peaceful purposes.