1. : to gain ascendancy through strength or superiority : triumph. 2. : to be or become effective or effectual. 3. : to use persuasion successfully. prevailed on him to sing. 4. : to be frequent : predominate. the west winds that prevail in the mountains. 5. : to be or continue in use or fashion : persist. a custom that still prevails. Synonyms. More @Wikipedia
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