vb. To put or bring into credit; to invest with credit or authority; to sanction. To send with letters credential, as an ambassador, envoy, or diplomatic agent; to authorize, as a messenger or delegate. To believe; to credit; to put trust in. To credit; to vouch for or consider (some one) as doing something, or (something) as belonging to some one. The act by which a diplomatic agent is acknowledged by the government near which he is sent. This at once makes his public character known, and becomes his protection. Also the status given by an authorizing body in a profession or academic field to signify a certain level of attainment or excellence.