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Definition of deficient adjective from the Oxford Advanced American Dictionary

     

    deficient

     adjective
    adjective
    NAmE//dɪˈfɪʃnt//
     
     
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  1. 1deficient (in something) not having enough of something, especially something that is essential a diet that is deficient in vitamin A
  2. 2(formal) not good enough Deaf people are sometimes treated as being mentally deficient.
See deficient in the Oxford Advanced Learner's Dictionary
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