What is Accreditation?

Legal Definition
Accreditation is the process in which certification of competency, authority, or credibility is presented.

Organizations that issue credentials or certify third parties against official standards are themselves formally accredited by accreditation bodies (such as UKAS); hence they are sometimes known as "accredited certification bodies". The accreditation process ensures that their certification practices are acceptable, typically meaning that they are competent to test and certify third parties, behave ethically and employ suitable quality assurance.
-- Wikipedia
Legal Definition
Certification in a subject. It ensures integrity of an agency and is awarded to organizations as well.