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prevalence (n.)

1590s, "fact of having mastery," from Middle French prévalence (15c.), from Late Latin praevalentia, from praevalens, present participle of praevalere (see prevalent). Meaning "condition of being widespread or general" is from 1713.

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Definitions of prevalence from WordNet

prevalence (n.)
the quality of prevailing generally; being widespread;
he was surprised by the prevalence of optimism about the future
prevalence (n.)
(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;
prevalence (n.)
a superiority in numbers or amount;
Synonyms: preponderance
From wordnet.princeton.edu