A person who suffers from a deficiencies in social-emotional range/approach. Typically unable to discern key verbal and non-verbal queues most
people and normally without much effort. This can impact social, relational,
work, academic and generally any aspect of life that demands higher social skill than the individual has the capacity for.
Coping with demand beyond this capacity causes in many repetitive motions, strict/rigid adherence to schedule and routine, extreme almost obsessive focus on key interest, and sensitivity to their environment.
By definition a wide and diverse group of individuals can fall into this group so it's easy to say that if you've meet one person with autism then you've simply meet one person with autism. Two
people with autism can be almost nothing alike except in the ways described above.
To bring balance to this definition
people with autism are capable of being some of the kindest and most
loyal people you may meet. Not to stereotype but to give a pop culture example of such Sheldon Cooper from Big Bang theory is played as an autistic and despite the ways he puts many
people off is is as
loyal a friend to those he allows to be his friend as most anyone can be.