Mass Noun

According to Merriam-Webster’s Dictionary, Terrorism is defined as follows:

 the systematic use of terror especially as a means of coercion

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Oxford takes it a bit further:

The unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims

And finally, the Urban Dictionary brings it all home:

Manipulation of any person or group of persons fear (the emotion of terror, hence TERRORism) in order to gain obedience/forceful agreement, or accomplish a certian objective.

-So there’s that.