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countdown
countenance
counter (1)
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counter-
counter card
Counter Reformation
counteract
counterargument
counterattack
counterattraction
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counteract

coun·ter·act [ kòwntər ákt ] (past and past participle coun·ter·act·ed, present participle coun·ter·act·ing, 3rd person present singular coun·ter·acts)


transitive verb 
Definition:
 
lessen effect of: to prevent something from having an effect, or lessen its effect


coun·ter·ac·tion noun
coun·ter·ac·tive adjective
coun·ter·ac·tive·ly adverb
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