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[fi-doo-shee-er-ee, -dyoo-] /fɪˈdu ʃiˌɛr i, -ˈdyu-/
noun, plural fiduciaries.
Law. a person to whom property or power is entrusted for the benefit of another.
Law. of or relating to the relation between a fiduciary and his or her principal:
a fiduciary capacity; a fiduciary duty.
of, based on, or in the nature of trust and confidence, as in public affairs:
a fiduciary obligation of government employees.
depending on public confidence for value or currency, as fiat money.
Origin of fiduciary
1585-95; < Latin fīdūciārius of something held in trust, equivalent to fīdūci(a) trust + -ārius -ary
Related forms
fiduciarily, adverb
nonfiduciary, adjective, noun, plural nonfiduciaries. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for fiduciary


noun (pl) -aries
a person bound to act for another's benefit, as a trustee in relation to his beneficiary
  1. having the nature of a trust
  2. of or relating to a trust or trustee
Derived Forms
fiduciarily, adverb
Word Origin
C17: from Latin fīdūciārius relating to something held in trust, from fīdūcia trust; see fiducial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fiduciary

1630s, from Latin fiduciarius "(holding) in trust," from fiducia "trust" from root of fidere "to trust" (see faith). 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, from 1630s.

Online Etymology Dictionary, © 2010 Douglas Harper
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