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derangement

derangement In historical psychology and psychiatry, derangement refers to a mental state seen as insanity or a departure from normal soundness of reason.

In historical psychology and psychiatry, derangement refers to a mental state seen as insanity or a departure from normal soundness of reason. A person was described as deranged when a clear form of insanity or mental irresponsibility was thought to be present.

Also see

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Derangement” (Derangement).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “derangement.” Development preview.

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