Their credential letters on both sides. --Camden.
2. pl. Testimonials showing that a person is entitled to
credit, or has right to exercise official power, as the
letters given by a government to an ambassador or envoy,
or a certificate that one is a duly elected delegate.
The committee of estates excepted against the
credentials of the English commissioners.
--Whitelocke.
Had they not shown undoubted credentials from the
Divine Person who sent them on such a message.
--Addison.