Confidential

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wiktionary

ref

From Latin confidentia +‎ -al.


etymonline

ref

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.