prevail (v.)

c. 1400, "be successful; be efficacious," from Old French prevaleir (Modern French prévaloir) and directly from Latin praevalere "be stronger, have greater power," from prae "before" (see pre-) + valere "have power, be strong" (from PIE root *wal- "to be strong"). Spelling in English perhaps influenced by avail. Related: Prevailed; prevailing.

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