1. The loss of the sense of pain, as that which is produced by the injection of local anesthetic agents or by systemic drugs; such as, the opioids, or resulting from disease interrupting pain pathways in the central or peripheral nervous system.
2. Analgesia, or the loss of the sense of pain, when produced by the injection of local anesthetic agents or by the systematic use of drugs; such as, certain opiates, or as a result of some disease that interrupts the pain pathways in the central or peripheral nervous system.

A state in which painful stimuli are so moderated that, though still perceived, they are no longer painful; and so there is no feeling of pain: "Rosemarie was grateful for the medication which induced a state of analgesia because now she was not aware of any significant pain."

Analgesia (feeling no pain or very little pain) produced by the insertion of acupunture needles at certain acupuncture points on the body.

This activates small myelinated nerve fibers in the muscles which transmit impulses to the spinal cord and then activate three centers: the spinal cord, midbrain, and pituitary/hypothalamus in order to produce analgesia or no pain.

Continuous injection of an anesthetic solution into the sacral (triangular bone in lower back) and lumbar plexuses (network of nerves) within the epidural space (in the spine) to relieve the pain of parturition (act of giving birth).

Also used in general surgery to block the pain pathways caudal (back o thef body) to the umbilicus (navel or hollow on surface of stomach).

Analgesia (absence of pain) of the lower part of the body, including the lower limbs.

Local analgesia (no pain) produced by an anesthetic applied to the surface of mucous membranes; such as, those of the eyes, nose, throat, and urethra.