; Handicap:The term handicap derives from the medieval game Hand-in-cap, in which two players trade possessions, and a third, neutral person judges the difference of value between the possessions. The concept of a neutral person evening up the odds was extended to handicap racing in the mid-18th century, where horses carry different weights based on the umpire's estimation of what would make them run equally. In the early 20th century the word gained the additional meaning of describing a<unk> , in the sense that a person with a handicap was carrying a heavier burden than normal. This concept, then, adds to the conception of<unk>  as a burden, or individual problem, rather than a societal problem. ; Accessibility: Accessibility is the degree to which a product, service or environment is available for use to the people that need it. People with certain types of<unk> es struggle to get equal access to some things in society. For example, a blind person cannot read printed ballot papers, and therefore does not have access to voting that requires paper ballots. ; Accommodation: A change that improves access. For example, if voting ballots are available in braille or on a text-to-speech machine, or if another person reads the ballot to the blind person and recorded the choices, then the blind person would have access to voting.
Disability
Social degeneration
Psychological dependence
Sickness behavior
Distress 
Psychological resistance
Physical disability
Physical dependence