World English Dictionary
paranoia (ˌpærəˈnɔɪə)
1.  a form of schizophrenia characterized by a slowly progressive deterioration of the personality, involving delusions and often hallucinations
2.  a mental disorder characterized by any of several types of delusions, in which the personality otherwise remains relatively intact
3.  informal intense fear or suspicion, esp when unfounded
[C19: via New Latin from Greek: frenzy, from paranoos distraught, from para-1 + noos mind]
adj, —n
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
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