Definition of decay noun from the Oxford Advanced American Dictionary

      

    decay

     noun
    noun
    NAmE//dɪˈkeɪ//
     
    [uncountable]
     
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  1. 1the process or result of being destroyed by natural causes or by not being cared for (= of decaying) tooth decay The landlord had let the building fall into decay. The smell of death and decay hung over the town. The decay of the wood will spread if it is not removed.
  2. 2 the gradual destruction of a society, an institution, a system, etc. economic/moral/urban decay the decay of the steel industry
See the Oxford Advanced Learner's Dictionary entry: decay

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