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Webster 1828 Edition

, n.

A putting out of order; disturbance of regularity or regular course; embarrassment.

Disorder of the intellect or reason; delirium; insanity; as a derangement of the mental organs.

See also: dérangement

derangement ‎(plural derangements)

The property of being deranged.
An act or instance of deranging.
(mathematics) A permutation of a set such that no element is in its previous position.

the property of being deranged

act or instance of deranging