M-expression LISP (MLISP) The original "{meta-language}" {syntax} of {Lisp}, designed by {John McCarthy} in 1962. MLISP was intended for external use in place of the parenthesised {S-expression} {syntax}. ["LISP 1.5 Programmer's Manual", J. McCarthy et al, MIT Press 1962]. (1994-11-22)