Definitions
1.noun(usually uncountable) The view that all endeavours are devoid of objective meaning.
2.noun(usually uncountable) The rejection of, or opposition to, religious beliefs, (inherent or objective) moral principles, legal rules, etc., often due to the view that life is meaningless (sense 1).
3.noun(usually uncountable) The rejection of non-proven or non-rationalized assertions in the social and political spheres of society.
4.nounA delusion that oneself or the world, or parts thereof, have ceased to exist.
5.noun(Russia) Alternative letter-case form of Nihilism
6.nounA doctrine grounded on the negation of one or more meaningful aspects of life; in particular, the view that nothing in the world actually exists.
7.nounSomething that is regarded as meaningless.