counteract

[ koun-ter-akt ]
/ ˌkaʊn tərˈækt /

verb (used with object)

to act in opposition to; frustrate by contrary action.

Origin of counteract

First recorded in 1670–80; counter- + act
Related forms
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for counteract

British Dictionary definitions for counteract

counteract

/ (ˌkaʊntərˈækt) /

verb

(tr) to oppose, neutralize, or mitigate the effects of by contrary action; check
Derived Formscounteraction, nouncounteractive, adjectivecounteractively, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for counteract

counteract


v.

1670s, from counter- + act (v.). Related: Counteracted; counteracting.

Online Etymology Dictionary, © 2010 Douglas Harper