par·a·noi·a (p?r??-noi??)n.1. Irrational distrust or suspicion of others, especially as occurring in people with psychiatric disorders such as paranoid personality disorder and schizophrenia: paranoia about neighbors stealing from his vegetable garden.2. Intense anxiety or worry: paranoia about losing her job.[Greek, madness, from paranoos, demented : para-, beyond; see para-1 + nous, noos, mind.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.paranoia (?pær??n???) n1. (Psychiatry) a form of schizophrenia characterized by a slowly progressive deterioration of the personality, involving delusions and often hallucinations2. (Psychiatry) a mental disorder characterized by any of several types of delusions, in which the personality otherwise remains relatively intact3. (Psychology) informal intense fear or suspicion, esp when unfounded[C19: via New Latin from Greek: frenzy, from paranoos distraught, from para-1 + noos mind] paranoiac, paranoic adj, nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014par?a?noi?a (?pær ??n?? ?) n. 1. a mental disorder characterized by systematized delusions ascribing hostile intentions to others, often linked with a sense of mission. 2. baseless or excessive distrust of others. [1805?15;