Abnormality, in the sense of something deviating from the normal or differing from the typical (such as an aberration),'s a subjectively defined behavioral characteristic, assigned to those with rare or dysfunctional conditions. Defining who's normal or abnormal's a contentious issue in abnormal psychology. Several conventional criteria One criterion for "abnormality" that may appear to apply in the case of abnormal behavior's statistical infrequency. This has an obvious flaw — the extrem… (More on Abnormal)