prevalence

Noun
  1. The quality of prevailing generally;
    Being widespread (synset 104772610)
    "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 (synset 113846326)
  3. A superiority in numbers or amount (synset 105129364)
    "a preponderance of evidence against the defendant"

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