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Dictionary definition for: Counteract

1. (v) act in opposition to

2. (v) oppose or check by a counteraction

3. (v) oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues"

4. (v) destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"

WordNet 2.1 Copyright Princeton University. All rights reserved.