| delusional powers or abilities | Fixed false beliefs, which are not amenable to arguments or facts to the contrary and which are not shared by others of similar cultural background. A characteristic of schizophrenia. (27 Sep 1997) |
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| delusional | Of or pertaining to delusions; as, delusional monomania. Source: Websters Dictionary (01 Mar 1998) |
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| delusional disorder | A severe mental disorder characterised by the presence of delusions. The delusions may be related to paranoid, grandiose, somatic, or erotic themes. (05 Mar 2000) |