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Definition of Pervasive developmental disorder
1. Noun. A group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication. ¹
¹ Source: wiktionary.com
Medical Definition of Pervasive developmental disorder
1. A class of mental disorders of infancy, childhood, or adolescence characterised by distortions in the development of the multiple basic psychological functions involved in the development of social skills and language. (05 Mar 2000)