- total rejection of established laws and institutions.
- anarchy, terrorism, or other revolutionary activity.
- total and absolute destructiveness, especially toward the world at large and including oneself: the power-mad nihilism that marked Hitler's last years.
- Philosophy.
- an extreme form of skepticism: the denial of all real existence or the possibility of an objective basis for truth.
- nothingness or nonexistence.
- the principles of a Russian revolutionary group, active in the latter half of the 19th century, holding that existing social and political institutions must be destroyed in order to clear the way for a new state of society and employing extreme measures, including terrorism and assassination.
- annihilation of the self, or the individual consciousness, especially as an aspect of mystical experience.
- a complete denial of all established authority and institutions
- an extreme form of scepticism that systematically rejects all values, belief in existence, the possibility of communication, etc
- a revolutionary doctrine of destruction for its own sake
- the practice or promulgation of terrorism
- (in tsarist Russia) any of several revolutionary doctrines that upheld terrorism
