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Origin of sickness

before 1000; Middle English siknesse, seknesse, Old English sēocnesse. See sick1, -ness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sickness


  1. an illness or disease
  2. nausea or queasiness
  3. the state or an instance of being sick
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 sickness

Old English seocnes "sickness, disease; a disease;" see sick (adj.) and -ness.

Online Etymology Dictionary, © 2010 Douglas Harper

sickness in Medicine


  1. The condition of being sick; illness.
  2. A disease or an illness.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.