Computer term: "Rapid Application Devolopment" Software used to devolop software easily and fast. RAD software usually does most of the work for you.
See term 2 of IDE.
A term often used in counterstrike to describe "Reload and Die". This term was coined in October 2005 after an extremely popular counterstrike clan named |-=RAD=-> made a public announcement for suggestions on a good meaning for the clan name. Originally named atfer the founder, Richard A deChevigny.