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.
Disability-Income (DI) Insurance. DEFINITION of 'Disability-Income (DI) Insurance'. An insurance product that provides supplementary income in the event of an illness or accident resulting in a disability that prevents the insured from working at their regular employment.