prevent
Americanverb (used with object)
-
prevents,
present (3rd person singular)
-
prevented,
past participle, past
-
preventing
present participle
-
to keep from occurring; avert; hinder.
He intervened to prevent bloodshed.
-
to hinder or stop from doing something.
There is nothing to prevent us from going.
-
Archaic. to act ahead of; forestall.
-
Archaic. to precede.
-
Archaic. to anticipate.
verb (used without object)
-
prevents,
present (3rd person singular)
-
prevented,
past participle, past
-
preventing
present participle
verb
-
(tr) to keep from happening, esp by taking precautionary action
-
to keep (someone from doing something); hinder; impede
-
(intr) to interpose or act as a hindrance
-
archaic (tr) to anticipate or precede
Synonym Usage
Prevent, hamper, hinder, impede refer to different degrees of stoppage of action or progress. To prevent is to stop something effectually by forestalling action and rendering it impossible: to prevent the sending of a message. To hamper is to clog or entangle or put an embarrassing restraint upon: to hamper preparations for a trip. To hinder is to keep back by delaying or stopping progress or action: to hinder the progress of an expedition. To impede is to make difficult the movement or progress of anything by interfering with its proper functioning: to impede a discussion by demanding repeated explanations.
Other Word Forms
Derived Forms
-
preventabilitynoun
-
preventabiltynoun
-
nonpreventableadjective
-
nonpreventibleadjective
-
preventableadjective
-
preventibleadjective
-
quasi-preventedadjective
-
unpreventableadjective
-
unpreventedadjective
-
unpreventibleadjective
-
preventablyadverb
-
preventinglyadverb
Inflected Forms
Participles
Conjugated Forms
Present
-
preventsimple
-
preventssimple
-
have preventedperfect
-
has preventedperfect
-
am preventingprogressive
-
are preventingprogressive
-
is preventingprogressive
-
have been preventingperfect progressive
-
has been preventingperfect progressive
Past
-
preventedsimple
-
had preventedperfect
-
was preventingprogressive
-
were preventingprogressive
-
had been preventingperfect progressive
Future
Etymology
Origin of prevent
First recorded in 1375–1425; late Middle English, from Latin praeventus “anticipated,” past participle of praevenīre “to anticipate,” equivalent to prae- pre- ( def. ) + venīre “to come”
Explanation
The verb prevent means "to keep something from happening," like when you use a complicated password to prevent hackers from accessing your account. Prevent comes from the Latin word praeventus, meaning "to act in anticipation of," like when you shovel the icy, snow-covered sidewalk to prevent people from falling. Prevent can also mean "to make impossible," like when a school locks the doors during a dance to prevent kids from leaving without their parents knowing.
Vocabulary lists containing prevent
"Handle with Care"
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!
The Search Is Over: Synonyms for "Stop"
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
1.7.B Using Ice to Keep Orange Groves Warm
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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:
Whether this was the correct course of action, and whether the decision was influenced by wanting to prevent the grand prix finishing under caution, will remain a subject for debate.
From BBC ● Sep. 29, 2026
Earlier this month, Anthropic CEO Dario Amodei advocated for a slowdown of AI development to prevent harmful behaviors from AI models.
From MarketWatch ● Sep. 29, 2026
Beutner had structured Proposition 28 precisely to prevent this supplanting of funds.
From Los Angeles Times ● Sep. 28, 2026
"We are demanding that this decree-law be enacted, to protect the right to housing and prevent evictions," said Carlota, a 29-year-old protester who spend the night among the tents set up in the touristic square.
From Barron's ● Sep. 28, 2026
Who could prevent more people from falling under Soviet control?
From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin
![]()
“Rejection of a settlement supports prices because disruption risk remains unresolved, while evidence that significant volumes are still moving prevents the market from pricing a complete supply shutdown,” says Naeem Aslam from Zaye Capital Markets.
From The Wall Street Journal ● Sep. 28, 2026
The First Amendment prevents government censorship, but one reason there are social penalties, including criticism, shunning and firing for hateful rhetoric, is that it is not, in fact, harmless.
From Salon ● Sep. 25, 2026
“There is no evidence that any multi-cancer detection testing prevents cancer, consistently detects it at an earlier stage, or reduces cancer-associated mortality,” two researchers wrote in the Lancet this week.
From MarketWatch ● Sep. 23, 2026
The moisture in the air prevents the body from efficiently sweating which is needed to regulate the body’s temperature, Benmarhnia said.
From Los Angeles Times ● Sep. 9, 2026
She feels Geak bounce slightly on her back as she catches her balance and prevents herself from a fall in the mud.
From "First They Killed My Father: A Daughter of Cambodia Remembers" by Loung Ung
![]()
"This was collaborative problem-solving which prevented any further issues for the young seal and for road users."
From Barron's ● Sep. 28, 2026
After Thursday's announcement, Hearn said Joshua's contract specifically prevented White and American sports entertainment company TKO from having a promotional role, claiming Netflix had not been made aware of that provision.
From BBC ● Sep. 27, 2026
They welcome the announcement since the continuing legal case may have prevented some investors taking a position.
From The Wall Street Journal ● Sep. 25, 2026
Roberts noted that injuries prevented the Sparks from picking up any momentum during the season.
From Los Angeles Times ● Sep. 25, 2026
These early equation-laws were extremely good at expressing simple relationships, but equations have limitations—their constancy, which prevented them from being universal laws.
From "Zero: The Biography of a Dangerous Idea" by Charles Seife
![]()
Yet preventing cheating is only the beginning of the conversation.
From The Wall Street Journal ● Sep. 28, 2026
Another new law will enhance access to drugs known as PrEP and PEP, which are aimed at preventing HIV.
From Los Angeles Times ● Sep. 27, 2026
While there is a need for more homes, house-building levels are flatlining due to "major barriers" preventing their construction, it said.
From BBC ● Sep. 26, 2026
The researchers say the findings highlight the importance of preventing infections that can be transmitted to a fetus during pregnancy.
From Science Daily ● Sep. 23, 2026
Ordinary people became aware of the importance of cleanliness in preventing infection.
From "Ambushed!" by Gail Jarrow
![]()
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.