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
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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.
See Examples For:
It may also illuminate some of the ancient chemical steps that eventually contributed to the emergence of life on Earth.
From Science Daily ● Jul. 19, 2026
They play with perspective, color, space and time to illuminate postwar American tensions, be they racial, political or existential.
From Los Angeles Times ● Jun. 9, 2026
The museum’s annual Costume Institute show, housed in a new exhibition space, pairs garments with works of art from its collection to illuminate the far-reaching relationship between style and the body.
From The Wall Street Journal ● May 10, 2026
May's full Moon is set to illuminate the night sky on Friday 1 May.
From BBC ● Apr. 30, 2026
“Would you—or Steve—please illuminate for the class how your cipher works?”
From "Book Scavenger" by Jennifer Chambliss Bertman
With an incredible cast, including Lesley Manville, Kevin Doyle and Lorraine Ashbourne, it is deeply moving drama that illuminates the personal price of social divisions.
From Los Angeles Times ● Jun. 8, 2026
As the afternoon sunshine pours in through a stained-glass window, it illuminates a century-old design of a man dribbling a football across a pitch.
From BBC ● Jun. 5, 2026
While we’re on the topic of Brin and Lake Tahoe, let me share another early anecdote that illuminates the mindset I’m referring to, and that I wrote about way back in 1999.
From MarketWatch ● Jun. 1, 2026
But cooking a people’s food illuminates how cuisines are shaped by religion, history and geography.
From The Wall Street Journal ● Apr. 17, 2026
A green shaft of light bursts out of the Holo and illuminates his face.
From "Mockingjay" by Suzanne Collins
The experiments showed that the shape of the illuminated area is what matters most.
From Science Daily ● Jul. 6, 2026
Five eyeball-style air vents, with illuminated bezels and metallic accents, are arrayed across the dash.
From The Wall Street Journal ● May 30, 2026
The work depicts a group of characters who find themselves trapped in a warren of bizarrely laid-out rooms resembling empty offices, illuminated by a pallid yellow light.
From Barron's ● May 28, 2026
At the top of the set's illuminated stairs she would forget her steps.
From BBC ● May 25, 2026
A soft chiming filled the room as the light illuminated their awestruck faces.
From "The Way to Rio Luna" by Zoraida Cordova
It was illuminating to hear the period-instrument orchestra—led by Geoffrey Loff, who also played keyboard—with its softer strings and prominent bassoons, though the continuo cellist struggled with coordination.
From The Wall Street Journal ● Jul. 20, 2026
But the film’s screenplay — a biting, laugh-a-minute wonder penned by Rashida Jones and Will McCormack — shrewdly plays with genre conventions and audience expectations, illuminating more depth with every other sentence.
From Salon ● Jul. 5, 2026
Judging by the smiles and charmed looks on shoppers’ faces, her produce-inspired candles are less about illuminating rooms and more about sharing the joy she sought when she first started the company in 2018.
From Los Angeles Times ● Jul. 1, 2026
This is going to be painful in ways that you can’t foresee, but if you remain adaptable and empathetic, you could be embarking on an illuminating chapter of your life.
From MarketWatch ● Jun. 29, 2026
We both settle back into our writing, the light of the afternoon illuminating our words.
From "Across So Many Seas" by Ruth Behar
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.
