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in operation is an adjective meaning "being in effect or operation". It carries one recorded sense.
being in effect or operation
“de facto apartheid is still operational even in the `new' African nations”
“bus service is in operation during the emergency”
“the company had several operating divisions”
Definitions, synonyms and semantic relations for in operation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.