[ fi-doo-shee-er-ee, -dyoo- ]
See synonyms for fiduciary on
noun,plural fi·du·ci·ar·ies.
  1. Law. a person to whom property or power is entrusted for the benefit of another: All investment advisors registered with the Securities and Exchange Commission (SEC) must act as fiduciaries.

  1. Law. of or relating to the relationship of trust and good faith between a fiduciary and the person for whom the fiduciary acts: The executor of a will has a fiduciary duty to act in the best interest of the beneficiary.The banks do not assume any financial responsibility—they act in a fiduciary capacity only.The American Medical Association said that physicians have a fiduciary responsibility to patients.

  2. depending on public confidence for value or currency, as fiat money.

Origin of fiduciary

First recorded in 1585–95; from Latin fīdūciārius “holding on trust; a trustee,” equivalent to fīdūci(a) “trust” + -ārius -ary

Other words from fiduciary

  • fi·du·ci·ar·i·ly [fi-doo-shee-er-uh-lee, -dyoo-], /fɪˌdu ʃiˈɛr ə li, -ˌdyu-/, adverb
  • non·fi·du·ci·ar·y, adjective, noun, plural non·fi·du·ci·ar·ies.

Words Nearby fiduciary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fiduciary in a sentence

British Dictionary definitions for fiduciary


/ (fɪˈduːʃɪərɪ) law /

nounplural -aries
  1. a person bound to act for another's benefit, as a trustee in relation to his beneficiary

    • having the nature of a trust

    • of or relating to a trust or trustee

Origin of fiduciary

C17: from Latin fīdūciārius relating to something held in trust, from fīdūcia trust; see fiducial

Derived forms of fiduciary

  • fiduciarily, adverb

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