prevent

verb

pre·​vent pri-ˈvent 

prevented; preventing; prevents

transitive verb

1

: to keep from happening or existing

steps to prevent war

2

: to hold or keep back : hinder, stop

—often used with from

3

: to deprive of power or hope of acting or succeeding

4

archaic

a

: to be in readiness for (something, such as an occasion)

b

: to meet or satisfy in advance

c

: to act ahead of

d

: to go or arrive before

intransitive verb

: to interpose an obstacle

preventability

pri-ˌven-tə-ˈbi-lə-tē 

noun

preventable adjective

or less commonly preventible

pri-ˈven-tə-bəl 

preventer noun

Synonyms

• avert
• preclude
• avoid

Choose the Right Synonym for prevent

prevent, anticipate, forestall mean to deal with beforehand.

prevent implies taking advance measures against something possible or probable.

measures taken to prevent leaks

anticipate may imply merely getting ahead of another by being a precursor or forerunner or it may imply checking another's intention by acting first.

anticipated the question by making a statement

forestall implies a getting ahead so as to stop or interrupt something in its course.

hoped to forestall the sale

Examples of prevent in a Sentence

Seatbelts in cars often prevent serious injuries.

Can exercise and a healthy diet prevent heart disease?

The accident could have been prevented.

He grabbed my arm to prevent me from falling.

Bad weather prevented us from leaving.

How are you going to prevent him from finding out about the party?

Recent Examples on the Web

Sitting in a chair that supports movement, such as one with a self-adjusting recline mechanism, can help prevent this condition, according to Puleio. —Angelica Stabile, FOXNews.com, 11 July 2025

How to prevent exposure to the plague To prevent exposure to plague, Coconino County officials have the following tips: Avoid contact with wild animals. —Stephanie Innes, AZCentral.com, 11 July 2025

These plastic drain covers, marketed as replacements for in-ground pool drains, do not comply with the Virginia Graeme Baker Pool and Spa Safety Act—a federal law enacted to prevent entrapment and drowning in pools and spas. —MSNBC Newsweek, 11 July 2025

In Missouri, Republican lawmakers have been pushing a yearslong effort to prevent diversity and equity trainings. —Alecia Taylor july 11, Kansas City Star, 11 July 2025

Word History

Etymology

Middle English, to anticipate, from Latin praeventus, past participle of praevenire to come before, anticipate, forestall, from prae- + venire to come — more at come

First Known Use

15th century, in the meaning defined at sense 4c

Rhymes for prevent

• accent
• advent
• ascent
• assent
• augment
• cement
• consent
• dement
• descent
• detent
• dissent
• event

Kids Definition

prevent

verb

pre·​vent pri-ˈvent 

1

: to keep from happening

prevent accidents

2

: to hold or keep back : hinder, stop

bad weather prevented us from leaving

preventable adjective

also preventible

-ə-bəl