Long answer:
I'm not exactly your person with AS, but that's largely the reason why when I say autism, I mean the whole spectrum. I got the diagnosis of AS for where I live, am indeed totally AS according to Asperger's (the guy) description, could be HFA by modern standards, would be diagnosable as classical in the US (because I meet criteria for autistic disorder) and by all evidence, belong to a part of the spectrum to which few other people belong so saying 'autism' really shortens this down.
It also allows me to refer to the whole spectrum as I am certainly am today often 'looking about normal' (I think) but relate much better to what those with HFA to LFA write and say concerning my symptoms than to what those with modern AS say about themselves as I've been somewhere around MFA or so as a kid, while at the same time especially today I am functioning good in some areas that are supposedly (?) often difficult for those with even mild and hf AS such as a entirely special job where you're in contact with people for your whole 8-hour shift and got to talk, supervise, care for them and be involved with them personally.
Short answer:
I'd say kanner's or infantile autism (rarely) or classical autism (usually) to mean 'autistic disorder' or 'infantile autism' and AS to mean specifically Asperger's. I consider myself autistic. Edit: Which boils down to that, yes, I use autism to mean the whole spectrum.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett