What is the meaning of Paranoia?

The obsolete name for a psychotic disorder, now called delusional disorder, often (in one of six subtypes) characterized by delusions of persecution and a perceived threat against the individual affected with the disorder, and often associated with false accusations and a general mistrust of others

paranoia (state of being paranoid)

paranoia (a psychotic disorder characterised by delusions of persecution)

paranoia (psychiatric illness)

paranoia (being paranoid)

Source: wiktionary.org