Origin: Greek prefix para-
Paranoia has 2 different meanings across 1 category:
a psychological disorder characterized by delusions of persecution or grandeur
"The patient's severe paranoia manifested as relentless accusations that his neighbors were plotting to poison him while simultaneously believing he was the secret agent destined to save the world."
A psychotic disorder characterized by delusions of persecution, conspiracy and perceived threat against the person, often associated with false accusations and general mistrust of others
"His severe paranoia led him to call the police on his neighbors because he was convinced they were plotting a conspiracy to steal his identity."