means "without (a = without) any infection". All surgery should be done under "aseptic" conditions. Sepsis means some infectious microorganism is causing harm to the person. Antibiotics and cleansing are the normal treatments.
Asepsis is the practice to reduce or eliminate contaminants (such as bacteria, viruses, fungi, and parasites) from entering the operative field in surgery or medicine to prevent infection. Ideally, a field is "sterile" â€” free of contaminants â€” a situation that is difficult to attain. However, the goal is elimination of infection, not sterility.