the act or an instance of operating or being operated, or the method of operating
something done or to be done; an activity
the state of being functional or operative
The network is now in operation
a surgical procedure carried out on a living body with special instruments, usu for the repair of damage or the restoration of health
any of various mathematical or logical processes, e.g. addition, carried out to derive one expression from others according to a rule
a usu military action, mission, or manoeuvre and its planning
a business or financial transaction
a single step performed by a computer in the execution of a program