| pervasive developmental disorder n. Abbr. PDD Any of several disorders, such as autism and Asperger's syndrome, characterized by severe deficits in many areas of development, including social interaction and communication, or by the presence of repetitive, stereotyped behaviors. Such disorders are usually evident in the first years of life and are often associated with some degree of mental retardation. |
pervasive developmental disorder (p r-v  s v) Any of several developmental disorders, such as autism or Asperger's syndrome, characterized by severe deficits in social interaction and communication or by the presence of repetitive, stereotyped behaviors. Most of these disorders are evident in the first years of life. |
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