Autism spectrum disorder is a term used to include and replace all subtypes of autism, including autistic disorder, Asperger syndrome, childhood disintegrative disorder, and pervasive developmental disorder (not otherwise specified).
The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders, published in 2013, defines autism spectrum disorder as follows:
A. persistent deficits in social communication and social interaction across contexts, not accounted for by general developmental delays
B. Restricted, repetitive patterns of behavior, interests, or activities
C. Symptoms must be present in early childhood (but may not become fully manifest until social demands exceed limited capacities)
D. Symptoms together limit and impair everyday functioning.
Please see our detailed entry for Autism Spectrum Disorder