Etymology
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credentials (n.)

"letters entitling the bearer to certain credit or confidence," 1670s, from Medieval Latin credentialis, from credentia  "belief," from Latin credere "to believe, trust" (see credo). Probably immediately as a shortening of letters credential (1520s, with French word order); earlier was letter of credence (mid-14c.). Especially in reference to the letters of authorization given by a government to an ambassador.

updated on May 06, 2018

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Definitions of credentials from WordNet

credentials (n.)
a document attesting to the truth of certain stated facts;
From wordnet.princeton.edu, not affiliated with etymonline.