Definition of medical anesthesia.. Loss of sensation throughout the body with loss of consciousness to prevent pain during surgery by preventing nerve cells or pain signals

We can define anesthesia: that the patient loses his sense of pain, so that the surgeon can do what he has to do without harassment, and then return everything to nature gradually by drugs and dosages and the way to give them and countermeasures.
It can also be defined as: loss of sensation throughout the body, loss of sensation coincides with loss of consciousness, often general anesthetics, inhaled by the patient, gases, or liquids that turn into gases. Mixed gases are mixed with oxygen gas, or air, and then driven into a special device at a constant rate of flow. The patient, who begins to enter, gradually enters the anesthesia stage. We will explain this later.
In another way, it can be said to be a way to prevent pain during surgery, by preventing nerve cells or pain signals from moving to the nerves and reaching the brain.