Main entry: in operation, operating, operational
Definition: being in effect or operation
Usage: de facto apartheid is still operational even in the `new' African nations- Leslie Marmon Silko; bus service is in operation during the emergency; the company had several operating divisions
Main entry: operational
Definition: (military) of or intended for or involved in military operations
Main entry: usable, useable, functional, operable, operational
Definition: fit or ready for use or service
Usage: the toaster was still functional even after being dropped; the lawnmower is a bit rusty but still usable; an operational aircraft; the dishwasher is now in working order
Main entry: operational
Definition: pertaining to a process or series of actions for achieving a result
Usage: operational difficulties; they assumed their operational positions