FindLaw Legal Dictionary
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1 : inability to pursue an occupation because of a physical or mental impairment
: inability to engage in any substantial gainful activity because of a medically determinable physical or mental impairment that can be expected to result in death or to be of long continued or indefinite duration in accordance with the Social Security Act see also benefit Americans with Disabilities Act in the Important Laws section compare incapacity, occupational disease
2 : lack of legal qualification to do something [a minor's ]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.