For the purpose of serving students with disabilities, the ADA defines a disability as:

A person with a disability is defined as any person who
1. has a physical or mental impairment that substantially limits one or more major life activities,
2. has a record of having such an impairment, or
3. is regarded as having such an impairment

Examples of major life activities include walking, seeing, hearing, speaking, breathing, learning, concentrating, working, caring for oneself, major bodily functions, and performing manual tasks