cons is a fundamental function in all dialects of the Lisp programming language. Cons or CONS may also refer to: Science and technology Connection-Oriented Network Service, one of the two OSI network layer protocols CONS, a build automation Make replacement, written in Perl, succeeded by SCons Coagulase negative staphylococci (CoNS), a group of round bacteria lacking the enzyme coagulase Other uses Converse (shoe company), an American shoe manufacturer Emma Cons (1838–1912), British social reformer, socialist, educationalist and theatre manager See also Con (disambiguation)