Terrorism is "the systematic use of terror especially as a means of coercion." There is is no internationally agreed legal definition. In one modern definition of terrorism, it is violence against civilians to achieve political or ideological objectives by creating fear. Most common definitions of terrorism include only those acts which are intended to create fear (terror), are perpetrated for an ideological goal (as opposed to a lone attack), and deliberately target or disregard the safety of non-combatants. Some definitions also include acts of unlawful violence and war. Terrorism is also a form of unconventional warfare and psychological warfare. The word is politically and emotionally charged, and this greatly compounds the difficulty of providing a precise definition. One 1988 study ...more >>by the US Army found that over 100 definitions of the word "terrorism" have been used. A person who practices terrorism is a terrorist.