[{"Bold_text": "adjective", "List Items": ["used or engaged in performing operations :an operating surgeon.", "of, for, or pertaining to operations :an operating budget.", "of or relating to the proper operation a machine, appliance, etc.:a manual of operating instructions.", "Railroads.of, pertaining, or belonging to railroad workers, as engineers or firemen, who are directly engaged in the mechanical operation trains:an operating union."]}]