Illuminate definition
When you turn on a light, this is an example of a situation where you illuminate a room.
When you decorate your house for Christmas, this is an example of a situation where you illuminate a house.
When you give a simple explanation to help someone understand an issue, this is an example of a situation where the explanation illuminates the issue.
Other Word Forms
Noun
Origin of illuminate
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From American Heritage Dictionary of the English Language, 5th Edition
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From Wiktionary