someone's education, achievements, experience etc that prove they have the ability to do something
She had excellent credentials for the job.
There are doubts over his credentials as a future Prime Minister.
He spent the first part of the interview trying to establish his credentials as a financial expert.
Her academic credentials include an MA and a PhD.
a letter or other document which proves your good character or your right to have a particular position:
The commissioner presented his credentials to the State Department.