letter of credence

letter of credence
or letters of credence
Etymology: Middle English letter of credance, probably part translation of Medieval Latin litterae de credentia, litterae credentiae
: a formal document furnished a diplomatic agent for presentation to the government to which he is sent attesting to his power to act for his government or head of state — compare recredential

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letter of credence,
= letters of credence. (Cf.letters of credence)

Useful english dictionary. 2012.