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counteract

[koun-ter-akt] /ˌkaʊn tərˈækt/
verb (used with object)
1.
to act in opposition to; frustrate by contrary action.
Origin
1670-1680
1670-80; counter- + act
Related forms
counteractant, adjective
counteracter, counteractor, noun
counteractingly, adverb
counteraction, noun
counteractive, adjective
counteractively, adverb
noncounteractive, adjective
uncounteracted, adjective
Synonyms
neutralize, counterbalance, contravene, thwart.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter-actively

counteract

/ˌkaʊntərˈækt/
verb
1.
(transitive) to oppose, neutralize, or mitigate the effects of by contrary action; check
Derived Forms
counteraction, noun
counteractive, adjective
counteractively, 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
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Word Origin and History for counter-actively

counteract

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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