• WordNet 3.6
    • v counteract destroy property or hinder normal operations "The Resistance sabotaged railroad operations during the war"
    • v counteract oppose and mitigate the effects of by contrary actions "This will counteract the foolish actions of my colleagues"
    • v counteract act in opposition to
    • v counteract oppose or check by a counteraction
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Webster's Revised Unabridged Dictionary
  • Interesting fact: Fourteenth century physicians didn't know what caused the plague, but they knew it was contagious. As a result they wore an early kind of bioprotective suit which included a large beaked head piece. The beak of the head piece, which made them look like large birds, was filled with vinegar, sweet oils and other strong smelling compounds to counteract the stench of the dead and dying plague victims.
    • v. t Counteract To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.
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Century Dictionary and Cyclopedia
    • counteract To act in opposition to; hinder, defeat, or frustrate by contrary agency.
    • counteract Synonyms To thwart, check, contravene, cross, neutralize.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Counteract to act counter or in opposition to: to hinder or defeat
    • ***


Chambers's Twentieth Century Dictionary
Fr.,—L. contra, against.


In literature:

It is an evil that should be counteracted.
"Humanly Speaking" by Samuel McChord Crothers
He'll do anything for me; only, I see him so seldom that I can't counteract poor old Lily's influence.
"The Vehement Flame" by Margaret Wade Campbell Deland
Such speculation counteracted his usually good appetite.
"The Grey Cloak" by Harold MacGrath
Luis de Leon was not in a position to counteract the manoeuvres of his opponents.
"Fray Luis de León" by James Fitzmaurice-Kelly
Fortunately, Williams was in England at the time, and with indomitable energy he set to work to counteract the danger.
"England in America, 1580-1652" by Lyon Gardiner Tyler
Without a counteracting force, law will run on forever.
"The Other Girls" by Mrs. A. D. T. Whitney
To counteract this, Mr. Lincoln, at the advice of his leading friends, sent him a letter challenging him to joint public debate.
"A Short Life of Abraham Lincoln" by John G. Nicolay
In this case Dr. Merillat employed a weight to counteract muscular contraction.
"Lameness of the Horse" by John Victor Lacroix
How did the Romans endeavour to counteract it?
"Pinnock's Improved Edition of Dr. Goldsmith's History of Rome" by Oliver Goldsmith
They were not injured in the slightest respect, thanks to the means taken to counteract the shock.
"All Around the Moon" by Jules Verne

In news:

A stay from Macaluso seems unlikely, since it'd stop her own hold on bus parking on the lot—in effect counteracting her ruling until the Court of Appeals decides on the case.
"The good news is that when people become aware of these biases they can take steps to counteract them," Shauman said.
Did you know that certain types of exercise counteract the effects of poor posture endemic to people who work at desk jobs.
Local agencies offer ideas to counteract the holiday blues .
Vitamin K counteracts warfarin, so eating foods with vitamin K lowers the INR to make blood clots form easier.
New Orleans tourism boards find it difficult to counteract spill images.
Marquette scored just enough to counteract a fluky goal scored by Rhinelander, Wis. For a 2-1 high school soccer victory at the Kaufman Sports Complex on Saturday afternoon.
Real-Life Inception : Army Looks to 'Counteract Nightmares' With Digital Dreams.
Long haul truckers working to counteract health perils of hours on the road.
Irish drugmaker Warner Chilcott PLC said Friday its net income more than tripled in the third quarter, as restructuring costs decreased, which counteracted weakening sales of its osteoporosis drug Actonel.
The evidence I've mentioned is admittedly somewhat biased, designed to counteract the hype and show just how much debate and doubt persists.
The shades have melon undertones to counteract blue discoloration.
Research shows that estrogen can be used to counteract nerve cell degeneration caused by MS without increased risks of breast and uterine cancers.
Blade-mounted pitch sensors on the K2-Series small dozers (D3, D4, D5 and D6) tell the hydraulic system how to counteract a tractor's bucking to keep the blade cutting smooth.
With a typical dose of three to five vials to counteract the venomous sting , hospital bills for patients and their insurance companies can exceed $62,000.

In science:

The fact that the latter would give a much larger suppression for the same value of ˆq could help counteract, e. g., the effect of a larger initial quark-to-gluon ratio as suggested by Lappi’s calculations [ 57] mentioned above.
Quark Matter 2005 -- Theoretical Summary
Inverted wing profiles were initially used to provide stability or to counteract the tendency a car might have to lift at high speeds.
Explanation and discovery in aerodynamics
This also helps explain why the noise suppression is especially effective in this case by the fact that the mass M has its speed comparable to the target m but in an opposite direction such that the force it exerts through the spring g can favorably counteract the motion of the target m.
Noise Suppression for Micromechanical Resonator via Intrinsic Dynamic Feedback
To counteract this, one strategy is to use small-molecule inhibitors to block the protein-protein interaction of MDM2 and p53.
The p53-MDM2 network: from oscillations to apoptosis
This will give a negative 1-loop contribution for λ < √2MP l , so all datapoints will have a 1-loop correction in the origin which counteracts the tree-level potential.
D-term inflation after spontaneous symmetry breaking