Accelerated Healing is the ability to recover from bodily injuries or disease at a superhuman rate. It differs from Regeneration because although the character can repair from major tissue damage and even regenerate entire cells it cannot repair separated limbs or torn cells. So knee injuries will heal but if the knee is torn off then Accelerated Healing cannot help.
Other uses of Accelerated Healing include recovery from diseases and illnesses at an accelerated state. These can range from not being affected by colds to healing diseases such as Cancer or HIV in a matter of days.