(REPL) A programming structure wIThin LISP which repeatedly reads a form from the user, evaluates IT, and displays the result. A read-eval-print loop forms the basis of the Top-Levelshell that programmers of the LISP family of languages interact wITh. In many dialects of LISP a very simple REPL could be implemented as: (loop (print (eval (read)))). (2003-06-23)