prevalence
(noun)
noun
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