We don't have synonyms for prevalences yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are prevalence, prevalance and prevalency.
(n) :
The quality or condition of being prevalent; wide extension or spread.
(n) :
(epidemiology) The 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.
(n) :
The quality or condition of being prevalent; wide extension or spread.
(n) :
(epidemiology) The 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.