The number of cases of a disease - disorder or disability in a population - relative to the total number of people at risk of developing it; usually expressed as the number of cases per 1000 (or per 10 000 - or per 100 000 or per million) population.

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1. The number of cases of a disease - disorder or disability in a population - relative to the total number of people at risk of developing it; usually expressed as the number of cases per 1000 (or per 10 000 - or per 100 000 or per million) population.