a person, usually a member of a group, who uses or advocates terrorism.
a person who terrorizes or frightens others.
(formerly) a member of a political group in Russia aiming at the demoralization of the government by terror.
an agent or partisan of the revolutionary tribunal during the Reign of Terror in France.
of, pertaining to, or characteristic of terrorism or terrorists: terrorist tactics.

1785–95; terror + -ist; compare French terroriste

terroristic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
terrorist (ˈtɛrərɪst)
a.  a person who employs terror or terrorism, esp as a political weapon
 b.  (as modifier): terrorist tactics

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

in the modern sense, 1947, especially in reference to Jewish tactics against the British in Palestine -- earlier it was used of extremist revolutionaries in Russia (1866); and Jacobins during the French Revolution (1795) -- from Fr. terroriste; see terror +
-ist (also cf. terrorism). The tendency of one party's terrorist to be another's guerilla or freedom fighter was noted in ref. to the British action in Cyprus (1956) and the war in Rhodesia (1973). The word terrorist has been applied, at least retroactively, to the Maquis resistance in occupied France in World War II (e.g. in the "Spectator," Oct. 20, 1979).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for terrorist
Leaderless resistance is also often wellsuited to terrorist objectives.
Mad stan a terrorist who rebels against what he sees as a corrupt system.
And because of this, they were believed to be involved in a terrorist activity.
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