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[Latin nihil, nothing, + –ism.]

noun

Philosophy

An extreme form of skepticism that denies all existence.

A doctrine holding that all values are baseless and that nothing can be known or communicated.

Rejection of all distinctions in moral or religious value and a willingness to repudiate all previous theories of morality or religious belief.

The belief that destruction of existing political or social institutions is necessary for future improvement.

A diffuse, revolutionary movement of mid 19th-century Russia that scorned authority and tradition and believed in reason, materialism, and radical change in society and government through terrorism and assassination.

Psychiatry A delusion, experienced in some mental disorders, that the world or one’s mind, body, or self does not exist.

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