It tends to be used for any learning disorder or mental health diagnosis that either isn't inherently harmful or isn't an overt break with reality. Most people

It tends to be used for any learning disorder or mental health diagnosis that either isn't inherently harmful or isn't an overt break with reality. Most people using the term would definitely include ADHD and at least the high functioning end of the autism spectrum. Many would also include things like OCD and perhaps depression. Another way to say it is that it is used for mental conditions which fall under the social model of disability. That is to say, they are primarily harmful due to society not accommodating them as opposed to being inherently harmful. Things like ADHD and high functioning autism are primarily problems because they don't fit into society's expectations. On the other hand, schizophrenia is much more inherently disabling.