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Definition of proof adjective from the Oxford Advanced American Dictionary

     

    proof

     adjective
    adjective
    NAmE//pruf//
     
     
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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
    3. prove verb (≠disprove)proof nounproven adjective (≠unproven)
See proof in the Oxford Advanced Learner's Dictionary
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