illness

[il-nis]
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Origin of illness

First recorded in 1490–1500; ill + -ness

Synonyms for illness

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for illness

illness

noun
  1. a disease or indisposition; sickness
  2. a state of ill health
  3. obsolete wickedness
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 illness
n.

"disease, sickness," 1680s, from ill + -ness. Earlier it meant "bad moral quality" (c.1500).

Online Etymology Dictionary, © 2010 Douglas Harper

illness in Medicine

illness

[ĭlnĭs]
n.
  1. Disease of body or mind; poor health; sickness.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.