cyberattack /ˈsaɪ.bə.ɹəˌtæk/noun 1verb 1forms 3 noun1 •An attack or intrusion by means of a computer network such as the Internet, often for the purpose of spying.He also points out that if the US does come under cyberattack, we may be powerless to stop the attack. — 1996 verb1 •To launch a cyberattack.A study by security company Riptech found that in the six months after the Sept. 11 terrorist attacks, energy companies were cyberattacked at twice the rate of other industries surveyed. — 2003 formscyberattacked · cyberattacking · cyberattacks