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What is the difference in meaning between prevalent and prevailing? I'm not sure I get the nuance, if there is one.

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up vote 3 down vote accepted

As reported from the NOAD:

Wildflowers might be prevalent in the mountains during the spring months, but a particular type of wildflower might be the prevailing one. Prevalent, in other words, implies widespread occurrence or acceptance in a particular place or time (a prevalent belief during the nineteenth century), while prevailing suggests that something exists in such quantity that it surpasses or leads all others in acceptance, usage, or belief (the prevailing theory about the evolution of man).

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In my own words, here is an easy, albeit simplistic, way to differentiate between the two:

  • prevailing: dominating, e.g. prevailing factors, prevailing army

  • prevalent: widespread, e.g. malaria is prevalent in the tropics

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