prevalence
英 ['prev(?)l(?)ns; 'prev?l(?)ns; 'prev?l?ns]
美['pr?v?l?ns]
- n. 流行；普遍；廣泛
英英釋意
- 1. the quality of prevailing generally; being widespread;
- "he was surprised by the prevalence of optimism about the future"
- 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
- 3. a superiority in numbers or amount;
- "there is a preponderance of Blacks in our prisons"