What is autism?
It is not a mental health condition. It is not a learning disability. Although these can, and frequently do, occur alongside. Autism is a type of neurodivergence, meaning:
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differences in learning & thinking
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differences in feeling
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differences in speech, language, and communication needs
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diversity of the human mind
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neurological differences
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differences in sensory processing

Autistic people are often multiply Neurodivergent, meaning they can also be dyslexic, dyspraxic, ADHD for example
LANGUAGE: Shifting away from the Medical Model
Language is powerful. It shapes people's beliefs. Deficit labels continue to stigmatise Autistic people. The medical model of disability views autism as something that needs to be fixed andtreated. Historically autism has always been viewed through a medical model whereby professionals treat it, fix it, correct it (just with health conditions).
The Neurodiversity Paradigm has its roots in a Social Model of disability and is radically different to a medical model. It's actually the environment that disables people. The social / neurodiversity paradigm focuses on removing barriers in society that exclude and oppress neurodivergent people.
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impairments / deficits
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autism levels e.g. 1-3
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severe / mild autism
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functioning labels (high, low)
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symptoms
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person with autism
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attention seeking
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challenging behaviour
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challenges / difficulties
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autistic person
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characteristics
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traits
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strengths / needs
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disabled / disability

LANGUAGE: autistic person? Person with autism?
"Person with autism" - person-first language
"Autistic person" - identity-first language
The majority of autistic people prefer identity-first language: so "Autistic person". But why? Identity-first language makes it clear that being autistic is an inherent part of that person's identity. It's about empowerment, in the same way you would say "Chinese person" or "gay person" - not "person with Chinese" or "person with gayness".
It is imperative professionals use the language that autistic people prefer and listen to autistic people.

SOURCES
"Identity-First Language" / "The Significance of Semantics: Person-First Language: Why It Matters"- Lydia Brown, (04 AUGUST 2011) -https://www.autistichoya.com/2011/08/significance-of-semantics-person-first.html
"Identity-First Autistic" - Identity-First Autistic (identityfirstautistic.org)
Person-First Language: What It Is, and When Not To Use It - Person-First Language: What It Is, and When Not To Use It » NeuroClastic
LANGUAGE: Diagnosing Autism
For the purposes of giving the information you'll most likely read if you do a Google search of autism, or if you speak to a professional in the medical community, here is the current diagnostic criteria.
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Social communication / interaction difficulties e.g. "deficits in social reciprocity, abnormal speech, abnormalities in eye-contact, lack of facial expressions, absence of interest in peers".
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Fixated interests and repetitive behaviours e.g. "adverse response to specific sounds or textures, fixated interests, preoccupation with unusual objects"
