the.com/prevalence

means The proportion of a population or set of cases in which something is currently present or true.

from From Latin praevalentia, 'superior power or influence,' from praevalere — prae ('before') + valere ('to be strong'), the same root that gives us 'valid' and 'value.' The word originally meant having greater force or being predominant; the narrower statistical sense of 'how widespread something is at a given time' is a later, more technical narrowing of that older idea of one thing simply outweighing others.