Delusion

Παράκρουση είναι μια παραίσθη, φρένοπάθεια, delusion. It came up when Nikoletta sent this during the coronavirus plague:

Παρτούζα

this is a sex party. 

I learned it because during the Corona Quarantine, a piece of fake news circulated that the Belgian minister of Health banned orgies and sex parties, which involve intercourse with multiple partners.