(n)(psychiatry) an abnormal absorption with the self; marked by communication disorders and short attention span and inability to treat others as people
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
n. 1. (Med.) a mental disorder characterized by inability to engage in normal social interactions and intense self-absorption, and usually accompanied by other symptoms such as language dysfunctions and repetitive behavior. autism usually manifests itself at an early age [ PJC ]
2. behavior showing an abnormal level of absorption with one's own thoughts and disregard for external realities. [ PJC ]