Anesthesia (noun)

1. Lack of sensation or feeling, particularly in a certain part of the body.
2. A state of unconsciousness or insensitivity to pain induced by drugs or other means for the purpose of surgery or other medical procedures.

Origin:

From new latin, from greek an- "without" + aesthēsis "sensation".

Examples:

1. He was given anesthesia before the surgery.
2. The patient was under general anesthesia for the duration of the procedure.
3. The anesthesia made him unable to feel pain during the operation.
4. The anesthesia team was responsible for administering and monitoring the patient's anesthesia.
5. The patient was given local anesthesia for the dental procedure.