prevalence

noun

1. The quality or condition of being prevalent; wide extension or spread.

2. epidemiologyThe total number of cases of a disease in a given statistical population at a given time, divided by the number of individuals in that population.

3. The quality of prevailing generally; being widespread

   “he was surprised by the prevalence of optimism about the future”

4. (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

5. A superiority in numbers or amount

   “a preponderance of evidence against the defendant”

   Similar: preponderance