illuminate
Americanverb (used with object)
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to supply or brighten with light; light up.
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to make lucid or clear; throw light on (a subject).
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to decorate with lights, as in celebration.
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to enlighten, as with knowledge.
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to make resplendent or illustrious.
A smile illuminated her face.
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to decorate (a manuscript, book, etc.) with colors and gold or silver, as was often done in the Middle Ages.
verb (used without object)
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to display lights, as in celebration.
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to become illuminated.
adjective
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Archaic. illuminated.
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Obsolete. enlightened.
noun
verb
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(tr) to throw light in or into; light up
to illuminate a room
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(tr) to make easily understood; clarify
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to adorn, decorate, or be decorated with lights
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(tr) to decorate (a letter, page, etc) by the application of colours, gold, or silver
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(intr) to become lighted up
adjective
noun
Other Word Forms
Derived Forms
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illuminatornoun
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reilluminateverb
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illuminativeadjective
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semi-illuminatedadjective
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unilluminatedadjective
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illuminatinglyadverb
Inflected Forms
Participles
Conjugated Forms
Present
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illuminatesimple
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illuminatessimple
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have illuminatedperfect
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has illuminatedperfect
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are illuminatingprogressive
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am illuminatingprogressive
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is illuminatingprogressive
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have been illuminatingperfect progressive
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has been illuminatingperfect progressive
Past
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illuminatedsimple
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had illuminatedperfect
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was illuminatingprogressive
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were illuminatingprogressive
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had been illuminatingperfect progressive
Future
Etymology
Origin of illuminate
First recorded in 1400–50; late Middle English, from Latin illūminātus, past participle of illūmināre “to light up, brighten”; see illumine ( def. ), -ate 1 ( def. )
Explanation
To illuminate is to light up — with physical light or with an idea. A spotlight might illuminate an actor on stage, and a good chemistry teacher might illuminate students with a lesson on the atomic structure of hydrogen. Originally, the verb illuminate referred to decorating handwritten manuscripts with bright lettering or pictures. Monks illuminated manuscripts with colors like gold, silver, bright red, and blue. Nowadays you can illuminate anything in the dark — either literally or figuratively. If you are afraid of the dark, illuminate your bedroom. In the dark when it comes to organic chemistry? Get an illuminating tutor.
Vocabulary lists containing illuminate
100 Words Every Middle Schooler Should Know
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Let There Be Light: Lum and Luc
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Essential Academic Vocabulary for Middle School Students, List 4
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Now 21 and studying political science, Iwezue leads Team Illuminate, a collective she founded in 2021 to raise environmental awareness among young Nigerians.
From Barron's • Oct. 30, 2025
“I feel like there’s a hole in the night sky,” said Ben Davis, the founder of Illuminate, the San Francisco public arts nonprofit behind Bay Lights.
From New York Times • May 2, 2024
The agency agreed to bear the maintenance cost of $250,000 a year, while Illuminate at the time announced that it had raised $2 million from philanthropist Tad Taube to help make the project permanent.
From Los Angeles Times • Jan. 10, 2023
A recent cyberattack targeted a company, Illuminate Education, whose clients include L.A.
From Los Angeles Times • Sep. 7, 2022
Can'st thou with cold, unsympathizing light Illuminate the ruined maid's despair Without the echo of a lunar groan?
From Mountain idylls, and Other Poems by King, Alfred Castner
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
