(n) (epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ L. praevalentia: cf. F. prévalence. See Prevail. ] The quality or condition of being prevalent; superior strength, force, or influence; general existence, reception, or practice; wide extension; as, the prevalence of virtue, of a fashion, or of a disease; the prevalence of a rumor. [ 1913 Webster ]
The duke better knew what kind of argument were of prevalence with him. Clarendon. [ 1913 Webster ]
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