- A person, group, or organization that uses violent action, or the threat of violent action, to further political goals; frequently in an attempt to coerce either a more powerful opponent, (such as a citizen or group targeting a government), or conversely, a weaker opponent, (such as a government, or even an internal citizen or group, being targeted by a larger government).
- An agent or partisan of the revolutionary tribunal during the Reign of Terror in France.
- Of or relating to terrorism.
The use of the label "terrorist" is often controversial or subjective, since one person's terrorist may be another's "freedom fighter", and vice versa depending on somebody's personal ideology of beliefs. A cynical definition may be that a terrorist is someone who murders or terrorizes more of those for whom the terrorist is fighting, than his supposed enemies.