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1. Impairment of normal physiological function affecting part or all of an organism
   - illness, unwellness, malady
    
2. Defectiveness or unsoundness
   "drugs have become a sickness they cannot cure"; "a great sickness of his judgment"
    
3. The state that precedes vomiting
   - nausea

Derived forms: sicknesses

See also: sick

Type of: defectiveness, faultiness, health problem, ill health, symptom, unhealthiness

Encyclopedia: Sickness