Prevalence means there is a lot of something. If you get a bad grade on a paper for having a prevalence of typos, you need to proofread your work more carefully.

The word prevalence comes from the Latin praevalere, meaning "condition of being widespread or general." The word is often used to describe a phenomenon that is widespread in a community, like the prevalence of a disease across a country. Prevalence is another word for "commonness." If there's a prevalence of thefts in your neighborhood, that means the likelihood of your house getting robbed is pretty high.

Definitions of prevalence
  1. noun
    the quality of prevailing generally; being widespread
    “he was surprised by the prevalence of optimism about the future”
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    general acceptance or use
    type of:
    the quality of being general or widespread or having general applicability
  2. noun
    a superiority in numbers or amount
    synonyms: preponderance
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    type of:
    figure, number
    the property possessed by a sum or total or indefinite quantity of units or individuals
  3. noun
    (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
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    type of:
    the relative magnitudes of two quantities (usually expressed as a quotient)
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