English

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

     

    proof

     adjective
    adjective
    BrE BrE//pruːf//
     
    ; NAmE NAmE//pruːf//
     
    Materials and properties
     
    jump to other results
  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 Familyprove verb (disprove)proof nounproven adjective (unproven) Word Origin Middle 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.
See the Oxford Advanced American Dictionary entry: proof