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confidential (adj.)

1759, "indicating the confiding of a private intimacy," from Latin confidentia (see confidence) + -al (1). Sense of "intended to be treated as private" is from 1773; that of "enjoying the confidence of another" is from 1805. Related: Confidentially.

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Definitions of confidential from WordNet

confidential (adj.)
entrusted with private information and the confidence of another;
a confidential secretary
confidential (adj.)
(of information) given in confidence or in secret;
this arrangement must be kept confidential
Synonyms: secret
confidential (adj.)
denoting confidence or intimacy;
in confidential tone of voice
a confidential approach
confidential (adj.)
the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified;
From wordnet.princeton.edu