Asperger’s Disorder or AD refers to a pervasive developmental disorder characterized by major difficulties in social interaction and unusual patterns of interest and behavior in children with relatively intact cognitive and communication skills or without the language delays which is seen in Autism.
Children with this disorder also develop restricted, repetitive, and stereotyped patterns of behavior, interests, and activities.
Other definition:
Asperger’s disorder is a pervasive developmental disorder characterized by deficits in social skills and activities; similar to autism but does not include deficits in language or cognitive skills