/ ˈterərɪst; NAmE / noun
a person who takes part in terrorism :
The terrorists are threatening to blow up the plane.
a terrorist attack / bomb / group
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WORD ORIGIN
late 18th cent.: from French terroriste , from Latin terror , from terrere frighten. The word was originally applied to supporters of the Jacobins in the French Revolution, who advocated repression and violence in pursuit of the principles of democracy and equality.