noun

• (clinical psychology) A pervasive neurological condition that is observable in early childhood and persists throughout the lifespan, characterised by atypical communication, language development, eye contact, and sensory experiences.
• (broadly) Synonym of autism spectrum; a range of disorders.
• (clinical psychology, obsolete) A diagnosis involving a pathological tendency to engage in self-centered fantasy thinking, historically considered a symptom of insanity and/or schizophrenia.
• (Internet slang, offensive, derogatory or self-deprecatory) Abnormal and unhealthy focus or persistence, stereotypically coupled with low self-awareness and unhealthy hatred of opposition or criticism.