[dih-reynj-muh nt]
See more synonyms for derangement on

Origin of derangement

From the French word dérangement, dating back to 1730–40. See derange, -ment Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for derangement

jumble, disorder, muddle, lunacy, dementia, madness

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Contemporary Examples of derangement

Historical Examples of derangement

British Dictionary definitions for derangement


  1. the act of deranging or state of being deranged
  2. disorder or confusion
  3. psychiatry a mental disorder or serious mental disturbance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for derangement

1737, "disturbance of regular order," from French dérangement (17c.), from déranger (see derange). Of mental order, from 1800.

Online Etymology Dictionary, © 2010 Douglas Harper

derangement in Medicine


  1. Disturbance of the regular order or arrangement of parts in a system.
  2. Mental disorder; insanity.
Related formsde•range v.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.