prevalence -- (the quality of prevailing generally; being widespread; "he was surprised by the prevalence of optimism about the future")
prevalence -- ((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)
preponderance, prevalence -- (a superiority in numbers or amount; "a preponderance of evidence against the defendant")
(Sound)
