Wiktionary
a. activated; functional; functioning; operating; working
WordNet
adj. 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: operational, in operation(p), operating(a)]
Wikipedia
In Operation is the first live DVD from Hard-Fi, filmed at London's historic Astoria venue and the full live performance, during their sold out 15 date UK tour in December 2005. The CD/DVD reached #62 in the UK Album Chart.
Usage examples of "in operation".
He must believe then that the routine was still in operation, Craig decided, and bet everything on it.
She knew his regret for what his orders had required of him in Operation Jericho was genuine, just as she'd come to know Mercedes was right about his part in what happened to Madrigal's people.
That meant that a magic device, with a necessary backup, had to be transported to them and set in operation.
I don't think this incident is serious enough for me to delay leaving, and if Professor Hemmingwell and his men can get this unit back in operation in twelve hours, then there's very little time lost and we can go ahead with the tests on schedule.
This one, and the one the other city is in, must be the only ones in operation for hundreds of miles.
Proper training in operation and maintenance is the first defense, and so is physical separation, keeping one danger source as far from any other as the boat bay's servicing requirements permit.
But it does operate, and in operation it displaces temporal strata just as surely as those people in the pool are displacing water by plunging into it.
But its intelligence was limited in operation by the avian nervous system.
My mind raced, first in frustration and fury that this man had me completely at his mercy, and second, because now that I'd seen this power in operation I still knew nothing about how it worked.