Accessibility: a general term for the degree of ease that something (e.g., device, service, physical environment and information) can be accessed, used and enjoyed by persons with disabilities. The term implies conscious planning, design and/or effort to make sure something is barrier-free to persons with disabilities. Accessibility also benefits the general population, by making things more usable and practical for everyone, including older people and families with small children.
Disability: There are two common ways of looking at what disability is:
One way is to see a disability as a medical condition that a person has. From this perspective, disability covers a broad range and degree of conditions, some visible and some not visible. A disability may have been present from birth, caused by an accident, or developed over time. There are physical, mental, cognitive and learning disabilities, mental disorders, hearing or vision disabilities, epilepsy, drug and alcohol dependencies, environmental sensitivities and other conditions.
A newer way of looking at disability is that it is not something a person has. A person with a medical condition is not necessarily prevented (or disabled) from fully taking part in society. If society is designed to be accessible and include everyone, then people with medical conditions often don't have a problem taking part. From this point of view, disability is a problem that occurs when a person's environment is not designed to suit their abilities.
Ableism: attitudes in society that devalue and limit the potential of persons with disabilities. People with disabilities are assumed to be less worthy of respect and consideration, less able to contribute and take part, and of less value than other people. Ableism can be conscious or unconscious and is embedded in institutions, systems or the broader culture of a society.
Ontario Human Rights Commission, Glossary of human rights terms.
Other great definitions are available alongside the National Center on Disability and Journalism Style Guide
Disability Visibility by 
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