A partial or complete loss of sensation, with or without the loss of consciousness; as a result of disease, injury, or the administration of an anesthetic agent; usually by injection or inhalation: "Although anesthesia is used eliminate tactile sensibility, or of any of the other senses, it refers especially to the absence of pain, because it is induced to permit the performance of surgery or other painful procedures."

"Local anesthesia affects a limited area of the body; as opposed to general anesthesia, which impacts the whole body."

The index of anesthesia history, Parts 1, 2, and 3.