1. A condition in which someone is unable to perform because of physical or mental handicaps: When Susan fell on the steps she hurt her foot and, because of this disability, it was not possible for her to stand and make dinner in the kitchen that evening.
2. A medically diagnosed condition that makes it difficult to engage in the activities of daily life: Since Jane's eyesight was getting worse over the years, Dr. Smith said that, because of this disability, it would not be safe for her to drive her car anymore.
3. A condition, such as an illness or an injury, which damages or limits people's physical or mental capacities or functions: Greg's parents have learned to keep up positive attitudes about their son's disabilities which were acquired through a car accident the year before.
4. A sum of money paid to somebody, usually on a monthly basis, by a government agency or insurance company because a person is unable to work or to provide for the necessities of life: After their mother injured her back, she had to quit her job and go on disability.

Certain kinds of mental conditions that make the understanding of certain kinds of information very difficult to acquire: Pupils with learning disabilities often need special teaching techniques or classes so they can have greater success with their educational experiences.