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Meaning of deficient

de•fi•cient

Pronunciation: (di-fish'unt), [key]
— adj.
  1. lacking some element or characteristic; defective: deficient in taste.
  2. insufficient; inadequate: deficient knowledge.
—n.
  1. a person who is deficient, esp. one who is mentally defective.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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