1.
Someone’s ~ are their previous achievements, training, and general background, which indicate that they are qualified to do something.
...her ~ as a Bach specialist...
I can testify to the ~ of the clientele.
N-PLURAL: with supp
2.
Someone’s ~ are a letter or certificate that proves their identity or qualifications.
Britain’s new ambassador to Lebanon has presented his ~ to the President.
N-PLURAL: usu poss N