Etymology
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illness (n.)

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

updated on October 11, 2015

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Definitions of illness from WordNet

illness (n.)
impairment of normal physiological function affecting part or all of an organism;
Synonyms: unwellness / malady / sickness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.