(1) A process or series of acts especially of a practical or mechanical nature involved in a particular form of work
"The operations in building a house"
"Certain machine tool operations"
(2) A mode of conducting legal and parliamentary proceedings
(3) A particular course of action intended to achieve a result
"The procedure of obtaining a driver's license"
"It was a process of trial and error"
(4) A set sequence of steps, part of larger computer program