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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preilluminateverb (used with object)
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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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am illuminatingprogressive
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are 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
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
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.
I have a complete speaker system with flashing disco lights that illuminate with the beat of the music.
From Los Angeles Times • Feb. 14, 2025
For Wings, the light at the end of the tunnel began to illuminate with "Hi, Hi, Hi," which landed a hard-rocking autumn 1972 hit single.
From Salon • Apr. 25, 2023
Once mutually activated, both illuminate with a flashing green ring.
From The Verge • Oct. 31, 2019
Mr. Pasek and Mr. Paul illuminate with humor and delicacy the troubled hearts of their characters, and Steven Levenson’s book matches the complexity, and the compassion, of their work.
From New York Times • Dec. 6, 2016
M�zeray, in the first half of the century, Fleury, in the second, cannot be ranked among those writers who illuminate with profound and just ideas.
From A History of French Literature Short Histories of the Literatures of the World: II. by Gosse, Edmund
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.
