1. the quality of prevailing generally; being widespread

- he was surprised by the prevalence of optimism about the future

Definition categories: attribute, generality

2. (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

Definition categories: link, ratio

3. a superiority in numbers or amount

Similar word(s): preponderance

Definition categories: attribute, figure, number