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Autism spectrum disorder, especially a more severe form of the disorder characterized by significant impairments in social interaction and communication, highly repetitive behavior, and strong resistance to change.
au·tis′tic (-tĭk) adj. & n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in an autistic manner or the manner of a person who has autism
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014