The Collaborative International Dictionary of English v.0.48:
Accredit \Ac*cred"it\, v. t. [imp. & p. p. Accredited; p. pr.
& vb. n. Accrediting.] [F. accr['e]diter; [`a] (L. ad) +
cr['e]dit credit. See Credit.]
1. To put or bring into credit; to invest with credit or
authority; to sanction.
His censure will . . . accredit his praises.
These reasons . . . which accredit and fortify mine
2. To send with letters credential, as an ambassador, envoy,
or diplomatic agent; to authorize, as a messenger or
Beton . . . was accredited to the Court of France.
3. To believe; to credit; to put trust in.
The version of early Roman history which was
accredited in the fifth century. --Sir G. C.
He accredited and repeated stories of apparitions
and witchcraft. --Southey.
4. To credit; to vouch for or consider (some one) as doing
something, or (something) as belonging to some one.
To accredit (one) with (something), to attribute
something to him; as, Mr. Clay was accredited with these
views; they accredit him with a wise saying.
Bouvier's Law Dictionary, Revised 6th Ed (1856):
TO ACCREDIT, international law. 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.