A Procedure

A particular method for performing a task.
A series of small tasks or steps taken to accomplish an end.
(uncountable) The set of established forms or methods of an organized body for accomplishing a certain task or tasks.
The steps taken in an action or other legal proceeding.
(obsolete) That which results; issue; product.
(computing) A subroutine or function coded to perform a specific task, but does not return a value.
(medicine) A surgical operation.

(method): algorithm, method, process, routine
(set of established forms or methods of an organized body): protocol
(computing): function, routine, sub, subroutine, method (although some of these have slightly differing meanings in some programming languages)
(medicine): operation