Cambridge Advanced Learner's Dictionary
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Definition
paranoia noun
/ˌpær.əˈnɔɪ.ə/
/ˌper-/ n
/ˌper-/ n •
[C or U] an extreme and unreasonable feeling that other people do not like you or are going to harm or criticize you
There's a lot of paranoia about crime at the moment.
•
[U] specialized Someone who has paranoia has unreasonable false beliefs as a part of another mental illness, for example schizophrenia.
(Definition of paranoia noun from the Cambridge Advanced Learner's Dictionary)

