Terrorism

The act of terrorizing, or state of being terrorized; a mode of government by terror or intimidation.

The practise of coercing governments to accede to political demands by committing violence on civilian targets; any similar use of violence to achieve goals.

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