sickness

[sik-nis]
noun
1.
a particular disease or malady.
2.
the state or an instance of being sick; illness.
3.
nausea; queasiness.

Origin:
before 1000; Middle English siknesse, seknesse, Old English sēocnesse. See sick1, -ness

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sickness (ˈsɪknɪs)
 
n
1.  an illness or disease
2.  nausea or queasiness
3.  the state or an instance of being sick

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

sickness sick·ness (sĭk'nĭs)
n.

  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.
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Encyclopedia Britannica
Encyclopedia

sickness

a harmful deviation from the normal structural or functional state of an organism. A diseased organism commonly exhibits signs or symptoms indicative of its abnormal state. Thus, the normal condition of an organism must be understood in order to recognize the hallmarks of disease. Nevertheless, a sharp demarcation between disease and health is not always apparent

Learn more about sickness with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Yet her work as a nurse's aide was not her first encounter with pain and
  sickness.
Knowing everything about them could clarify their role in sickness and health.
The ceremony is or was supposed to purify the village and to protect the
  inhabitants from sickness and plague.
Join to them also sturdy and valiant beggars, cloaking their idle life under
  the colour of some disease or sickness.
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