counteract

play
verb coun·ter·act \ˌkau̇n-tər-ˈakt\

Definition of counteract

  1. transitive verb
  2. :  to make ineffective or restrain or neutralize the usually ill effects of by means of an opposite force, action, or influence a drug used to counteract fatigue

counteraction

play \ˌkau̇n-tər-ˈak-shən\ noun

counteractive

play \ˌkau̇n-tər-ˈak-tiv\ adjective

Examples of counteract in a sentence

  1. The drug will counteract the poison.

  2. this medication will counteract the symptoms but it won't kill the infection

1655

First Known Use of counteract

1655


COUNTERACT Defined for English Language Learners

counteract

play
verb coun·ter·act \ˌkau̇n-tər-ˈakt\

Definition of counteract for English Language Learners

  • : act against (something) : to cause (something) to have less of an effect or to have no effect at all


COUNTERACT Defined for Kids

counteract

play
verb coun·ter·act \ˌkau̇n-tər-ˈakt\

Definition of counteract for Students

counteracted

;

counteracting

  1. :  to make (something) have less of an effect or no effect at all The antidote counteracts the poison.


Medical Dictionary

counteract

play
transitive verb coun·ter·act \ˌkau̇nt-ə-ˈrakt\

Medical Definition of counteract

  1. :  to make ineffective or restrain or neutralize the usually ill effects of by an opposite force vitamin K counteracts the effects of warfarin

counteraction

\-ˈrak-shən\play noun


Seen and Heard

What made you want to look up counteract? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

capable of being altered or controlled

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • peter-bruegel-tower-of-babel-painting
  • What language does pajama come from?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!