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Definition: A utility designed to check for and remove computer viruses from a computer system. Most antivirus programs detect a virus in two ways: first, by searching every file on the system in an attempt to match thousands of virus “signature” code fragments; second, by monitoring the system in order to detect the malicious activities of viruses that were not detected by the first technique
Source: Pfaffenberger, Bryan. Webster's new world computer dicdtionary. London: Wiley, 2003. Print.