1. To set forth as believable; to declare that an organization or a person can provide the kind of services desired by others: The educational association only accredits programs that meet its high standards.
2. Officially to recognize a person or organization as having met the standards needed to accomplish what is required: The new dictionary program was accredited by the lexicography institute.
3. To send an ambassador, or other important official, to represent a country: Victor will be accredited as the new official representative for his country next week.

The action of vouching for or supplying evidence that certifies whether someone or an organization is officially recognized as an authorized provider of specifc services: "The accrediting agency of the United Nations approved the establishment of educational programs for the multitudes of refugees who were forced to leave their country because of the war."