CREDENTIAL

I. adjective Date: 15th century warranting credit or confidence, II. noun Date: 1655 something that gives a title to credit or confidence, testimonials or certified documents showing that a person is entitled to credit or has a right to exercise official power, certificate , diploma , III. transitive verb (-tialed; also -tialled; -tialing; also -tialling) Date: 1888 to furnish with ~s