American English

Definition of paranoia noun from the Oxford Advanced American Dictionary

     

    paranoia

     noun
    noun
    NAmE//ˌpærəˈnɔɪə//
     
    [uncountable]
     
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  1. 1 (medical) a mental illness in which a person may wrongly believe that other people are trying to harm them or that they are someone very important, etc.
  2. 2(informal) fear or suspicion of other people when there is no evidence or reason for this
See the Oxford Advanced Learner's Dictionary entry: paranoia