What does SURGERY mean?

noun

1. the branch of medical science that treats disease or injury by operative procedures“he is professor of surgery at the Harvard Medical School”
2. a room where a doctor or dentist can be consulted“he read the warning in the doctor's surgery”
3. a room in a hospital equipped for the performance of surgical operations“great care is taken to keep the operating rooms aseptic”
4. a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body“they will schedule the operation as soon as an operating room is available”