Meaning of “autism” in the English Dictionary

"autism" in British English

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autismnoun [ U ]

uk /ˈɔː.tɪ.zəm/ us /ˈɑː.t̬ɪ.zəm/

a failure to develop social abilities, language, and other communication skills to the usual level:

Autism is four times more common in boys than in girls.
autistic
adjective uk /ɔːˈtɪs.tɪk/ us /ɑːˈtɪs.tɪk/

One child in 5,000 is autistic.

(Definition of “autism” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"autism" in American English

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autismnoun [ U ]

us /ˈɔˌtɪz·əm/ medical

an illness that starts in young children and causes behavior that is unusually centered on the self while limiting development of social and communication skills

autistic
adjective us /ɔˈtɪs·tɪk/

She works with autistic children.

(Definition of “autism” from the Cambridge Academic Content Dictionary © Cambridge University Press)