American English

Definition of proof adjective from the Oxford Advanced American Dictionary



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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. Word Familyprove verb (disprove)proof nounproven adjective (unproven)
See the Oxford Advanced Learner's Dictionary entry: proof