Source : WordNet®

operational
     adj 1: pertaining to a process or series of actions for achieving a
            result; "operational difficulties"; "they assumed
            their operational positions"
     2: fit or ready for use or service; "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" [syn: {functional},
         {usable}, {useable}, {in working order(p)}, {operable}]
     3: of or intended for or involved in military operations [ant:
        {nonoperational}]
     4: being in effect or operation; "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"
        [syn: {in operation(p)}, {operating(a)}]