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counterproductive
counterproof
counterpunch
counterreformation
counterrevolution
counterrevolutionary
countersank
counterscarp
countershading
countershaft
countersign
countersignature
countersink
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countersubject
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countervail

coun·ter·vail [ kòwntər váyl, kówntər vàyl ] (past and past participle coun·ter·vailed, present participle coun·ter·vail·ing, 3rd person present singular coun·ter·vails)


verb 
Definition:
 
1. transitive and intransitive verb exert counteracting effect: to exert a counteracting power or influence against something, especially against a harmful force, idea, or influence

2. transitive verb offset: to offset or compensate for something

[14th century. < Anglo-Norman contrevaloir, literally "be worth against"]
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