What is the definition of a disability?

As defined by Social Security, it is a physical or mental impairment that prevents an individual from engaging in any substantial, gainful activity, and which has lasted or is expected to last for at least 12 months, or is expected to result in death.  To apply for disability benefits, you must apply through the Social Security Administration offices, 1-800-772-1213 or 1-800-325-0778 (TTY).