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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illuminativeadjective
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semi-illuminatedadjective
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unilluminatedadjective
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illuminatinglyadverb
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reilluminateverb
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preilluminateverb (used with object)
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illuminatornoun
Conjugated Forms
Present
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has illuminatedperfect 3rd person singular
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have illuminatedperfect
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is illuminatingprogressive 3rd person singular
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illuminatingparticiple
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illuminatessingular 3rd person
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has been illuminatingperfect progressive 3rd person singular
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are illuminatingprogressive
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have been illuminatingperfect progressive
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am illuminatingprogressive 1st person singular
Past
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had illuminatedperfect
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had been illuminatingperfect progressive
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were illuminatingprogressive plural
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was illuminatingprogressive singular
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illuminatedparticiple
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illuminatedsimple
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.
Several local children with the condition joined him for a ceremony to illuminate the building in the campaign colour, teal.
From BBC • Jun. 8, 2026
The documents also illuminate a glaring contrast between the training of Marines and that of immigration agents, who have been accused repeatedly of using unnecessary force against peaceful protesters, bystanders and immigrants during enforcement operations.
From Los Angeles Times • May 6, 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
"Offering a powerful reflection of our world, the winners illuminate the realities we face globally; marked by fracture, urgency and yet an innate resilience," according to the World Press Photo statement.
From Barron's • Apr. 23, 2026
“To Marcus,” they said, and his name seemed to illuminate the room.
From "The Marvels" by Brian Selznick
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.
