Definitions of surgery:

• noun:   a room where a doctor or dentist can be consulted

  Example: "He read the warning in the doctor's surgery"

• noun:   the branch of medical science that treats disease or injury by operative procedures

  Example: "He is professor of surgery at the Harvard Medical School"

• noun:   a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

  Example: "He died while undergoing surgery"

• noun:   a room in a hospital equipped for the performance of surgical operations