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U.S. Department of Education: Promoting Educational Excellence for all Americans
Regulations: Part 300 / A / 300.8 / c / 1 / i

(i) Autism means a developmental disability significantly affecting verbal and nonverbal communication and social interaction, generally evident before age three, that adversely affects a child's educational performance. Other characteristics often associated with autism are engagement in repetitive activities and stereotyped movements, resistance to environmental change or change in daily routines, and unusual responses to sensory experiences.