terrorist act(n = noun.act) act of terrorism, terrorism - the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear;
is a kind of terror
has particulars: biological terrorism, bioterrorism, chemical terrorism, cyber-terrorism, cyberwar, domestic terrorism, eco-warfare, ecological terrorism, ecological warfare, ecoterrorism, international terrorism, narcoterrorism, nuclear terrorism, state-sponsored terrorism, theoterrorism, terrorist attack, red hand defenders, rhd

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