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Definition of decay noun from the Oxford Advanced Learner's Dictionary

decay

noun
 
/dɪˈkeɪ/
 
/dɪˈkeɪ/
[uncountable]
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  1. the 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.
    Extra Examples
    • My dentist could not find any signs of decay.
    • Smoking accelerates age-related decay in the heart and arteries.
    • The derelict buildings are the signs of a town in decay.
    • the slow decay of the castle and the surrounding buildings
    Oxford Collocations Dictionaryadjective
    • rapid
    • slow
    • dental
    verb + decay
    • cause
    • stop
    • reverse
    preposition
    • in decay
    • decay in
    • decay of
    phrases
    • the process of decay
    • signs of decay
    • an odour/​odor of decay
    See full entry
  2. the process of a society, an institution, a system, etc. being gradually destroyed
    • economic/moral/urban decay
    • the decay of the old industries
    Extra Examples
    • This government promises to reverse industrial decay.
    • Without a lot of money, the mayor won't be able to stop urban decay.
    Oxford Collocations Dictionaryadjective
    • rapid
    • slow
    • dental
    verb + decay
    • cause
    • stop
    • reverse
    preposition
    • in decay
    • decay in
    • decay of
    phrases
    • the process of decay
    • signs of decay
    • an odour/​odor of decay
    See full entry
  3. (physics) the process by which a radioactive substance changes to a different form by sending out radiation
    • Radioactive decay happens at a constant rate regardless of exposure to air.
    see also beta decayTopics Physics and chemistryc2
  4. Word Originlate Middle English: from Old French decair, based on Latin decidere ‘fall down or off’, from de- ‘from’ + cadere ‘fall’.
See decay in the Oxford Advanced American DictionarySee decay in the Oxford Learner's Dictionary of Academic English

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