Remediation is a term that relates to the act of correction.
Remediation is a term that is most often come across in the Change Management process area of the Service Transition volume in ITIL v3. Any change should have a remediation element. What to do if the change doesn't go according to plan?
Remediation for a change may be as simple as "Reverse each step taken so far" or there may be a series of complex instructions to be followed, including restoration of baselines. In rare circumstances a change may be authorized without a remediation consideration (e.g. emergency or security changes). In these situations the change is critical and the IT Service Provider has to either ensure a successful change or take steps to recticfy the circumstances if the change fails