This game was played in Piers Plowman, a poem from the 14th century.4 The concept of a neutral person evening up the odds was extended to handicap racing in the mid-18th century. In handicap racing, horses carry different weights based on the umpire's estimation of what would make them run equally. The use of the term to describe a person with a disability—by extension from handicap racing, a person carrying a heavier burden than normal—appeared in the early 20th century.5
Amundson, Ron. "The Meaning of 'Handicap'". University of Hawaii. http://www.uhh.hawaii.edu/~ronald/HandicapDefinition.htm ↩
"Handicaprice". Snopes.com. http://www.snopes.com/language/offense/handicap.asp ↩
"Definition of handicap in Oxford Dictionaries (British & World English)". Archived from the original on August 24, 2012. Retrieved 12 April 2013. https://web.archive.org/web/20120824235135/http://oxforddictionaries.com/definition/english/handicap ↩
"Online Etymology Dictionary". Online Etymology Dictionary. Retrieved 12 April 2013. http://etymonline.com/?term=handicap ↩