illuminate
Americanverb (used with object)
-
illuminates,
present (3rd person singular)
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illuminated,
past participle, past
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illuminating
present participle
-
to supply or brighten with light; light up.
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to make lucid or clear; throw light on (a subject).
-
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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illuminates,
present (3rd person singular)
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illuminated,
past participle, past
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illuminating
present participle
-
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
-
had illuminatedperfect
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was illuminatingprogressive
-
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.
See Examples For:
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
One paper argued that dog parks could illuminate “rape culture” and “queer performativity.”
From The Wall Street Journal ● May 27, 2026
"There is a pressing need for well-designed research projects in humans, utilising labelled creatine to generate relevant data and illuminate the grey areas of our knowledge about these compounds," Dr. Boroujerdi explains.
From Science Daily ● May 4, 2026
May's full Moon is set to illuminate the night sky on Friday 1 May.
From BBC ● Apr. 30, 2026
He would turn down virtually no request that helped illuminate texting and driving—or its risks.
From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel
It’s worth thinking about because it illuminates the principles that we should be applying to questions of governance in this country.
From Slate ● Jul. 31, 2026
Sarris hopes that the novel illuminates an uncomfortable history of Sonoma County that remains largely invisible, looming beneath the soil of wine country.
From Los Angeles Times ● Jun. 24, 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
It illuminates her face but casts shadows in her eyes.
From "The Belles" by Dhonielle Clayton
The eatery features Midcentury Modern touches with curved cherry wood walls and paneled ceilings, as well as illuminated white onyx Corian surfaces.
From Los Angeles Times ● Aug. 11, 2026
We went around the long dinner table, illuminated by a fireplace, and read what we’d scribbled.
From The Wall Street Journal ● Jul. 29, 2026
When the restored exterior is unveiled for the first time in seven years and illuminated for the first time ever, everyone will get to appreciate its beauty, said Mettham.
From BBC ● Jul. 26, 2026
Responding to the demand, Mayor Zohran Mamdani -- a passionate Arsenal supporter -- has announced five free, illuminated pitches open overnight across the city for the duration of the tournament.
From Barron's ● Jul. 9, 2026
Pillars of chalky light reached up from the ground and illuminated the chapel, which glowed, moonlike, against the night sky.
From "Educated" by Tara Westover
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
For Grant, the Square Mile is its own character in the American story, and it offers an illuminating window into how a young US might have looked at a turning point in history.
From BBC ● Jul. 1, 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
The lights in the stadium finally turn on, illuminating the space with blinding brightness.
From "Warcross" by Marie Lu
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.
