From Longman Dictionary of Contemporary Englishcyberterroristcy‧ber‧ter‧ror‧ist /ˈsaɪbəˌterərɪst $ -bər-/ noun [countable] someone who uses the Internet to damage computer systems, especially for political purposes Such a strategic attack, mounted by cyberterrorists, would shut down everything from power stations to air traffic control centres. —cyberterrorism noun [uncountable]