To understand why Linux has become so popular, it is helpful to know a little bit about its history. The first version of UNIX was originally developed several decades ago and was used primarily as a research operating system in universities.
Usage Note: Disabled is the clear preference in contemporary American English for referring to people having either physical or mental impairments, with the impairments themselves preferably termed disabilities.
Printer-friendly version. It is important to remember that in the context of the ADA, âdisabilityâ is a legal term rather than a medical one. Because it has a legal definition, the ADAâs definition of disability is different from how disability is defined under some other laws.The ADA defines a person with a disability as a person who has a physical or mental impairment that substantially limits one or more major life activity.This includes people who have a record of such an impairment, even if they do not currently have a disability.he ADA defines a person with a disability as a person who has a physical or mental impairment that substantially limits one or more major life activity. This includes people who have a record of such an impairment, even if they do not currently have a disability.