GNU Collaborative International Dictionary of English

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    Derangement , n. [Cf. F. dérangement.] The act of deranging or putting out of order, or the state of being deranged; disarrangement; disorder; confusion; especially, mental disorder; insanity.

    Syn. -- Disorder; confusion; embarrassment; irregularity; disturbance; insanity; lunacy; madness; delirium; mania. See Insanity.

    1913 Webster