n, pl  -ties  1  :  a diseased state or symptom <lumbar puncture, if improperly performed, may be followed by a significant -Jour. Amer. Med. Assoc.>   2  :  the incidence of disease  :  the rate of sickness (as in a specified community or group) <while TB mortality has declined fairly steadily, has been rising -Time>  - compare MORTALITY2   .
 
 
 
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