Definition of proof adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//pruːf//
    ; NAmE NAmE//pruːf//
    Materials and properties
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  1. 1proof against something (formal) that can resist the damaging or harmful effects of something The sea wall was not proof against the strength of the waves.
  2. 2(in compounds) that can resist or protect against the thing mentioned rainproof/windproof clothing The car has childproof locks on the rear doors. an inflation-proof pension plan See related entries: Materials and properties
  3. Word OriginMiddle English preve, from Old French proeve, from late Latin proba, from Latin probare ‘to test, prove’. The change of vowel in late Middle English was due to the influence of prove. Current senses of the verb date from the late 19th cent.Word Familyprove verb (disprove)proof nounproven adjective (unproven)
See the Oxford Advanced American Dictionary entry: proof