Etymology
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fiduciary (adj.)

1640s, "holding something in trust," from Latin fiduciarius "entrusted, held in trust," from fiducia "trust, confidence, reliance;" in law, "a deposit, pledge, security," from root of fidere "to trust" (from PIE root *bheidh- "to trust, confide, persuade"). In Roman law, fiducia was "a right transferred in trust;" paper currency sense (1878) is because its value depends on the trust of the public. As a noun, "one who holds something in trust," from 1630s.

updated on May 21, 2017

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Definitions of fiduciary from WordNet
1
fiduciary (n.)
a person who holds assets in trust for a beneficiary;
it is illegal for a fiduciary to misappropriate money for personal gain
2
fiduciary (adj.)
relating to or of the nature of a legal trust (i.e. the holding of something in trust for another);
a fiduciary contract
in a fiduciary capacity
Synonyms: fiducial
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.