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Noun sickness has 2 senses
illness, unwellness, malady, sickness - impairment of normal physiological function affecting part or all of an organism--1 is a kind of ill health, unhealthiness, health problem
 --1 has particulars:
 |  | ague; amyloidosis; anuresis, anuria; catastrophic illness; collapse; decompression sickness, aeroembolism, air embolism, gas embolism, caisson disease, bends; food poisoning, gastrointestinal disorder; lead poisoning, plumbism, saturnism; disease; hypermotility; indisposition; ozone sickness; toxemia of pregnancy, toxaemia of pregnancy, toxemia, toxaemia; growth | 
nausea, sickness - the state that precedes vomiting--2 is a kind of symptom
 --2 has particulars:
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