"relating to a base," 1832, originally in chemistry, from base (n.) + -ic.
computer language, 1964, initialism (acronym) for Beginners' All-purpose Symbolic Instruction Code; invented by Hungarian-born U.S. computer scientist John G. Kemeny and U.S. computer scientist Thomas E. Kurtz.
the basic ingredients
a basic fact
basic changes in public opinion occur because of changes in priorities
a basic story line
a basic course in Russian
a set of basic tools
basic training for raw recruits