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fiduciary

fih-DOO-shee-er-ee /fɪˈduː.ʃi.er.i/

adjectivenounC1GREGMATUPSC

formallegalprofessional

Involving trust, especially with regard to the relationship between a trustee and a beneficiary; a person who holds assets in trust for another.

A fiduciary duty is the highest standard of care imposed by law. It requires the fiduciary to act solely in the interest of the beneficiary, completely putting aside their own financial or personal interests.

The story behind the word. Fiduciary comes from the Latin 'fiducia', meaning trust or confidence, which in turn comes from 'fidere', meaning to trust. It is part of a large family of English words sharing this root, including 'fidelity' (faithfulness), 'confide' (to share secrets in trust), and 'confidence'.

Word relationships

trustee: A trustee is a specific legal role of someone holding property for another, while fiduciary is a broader term that describes any relationship or duty built on this high standard of trust.
guardian: A guardian is responsible for the personal and physical care of someone, whereas a fiduciary is typically responsible for managing assets or legal affairs.

Commonly confused with

pecuniary: Pecuniary means relating to or consisting of money, whereas fiduciary refers to a relationship of trust (which often, but not always, involves money).

Word family

fiducia (noun): A trust or confidence (Latin root, occasionally used in legal philosophy).

Collocations

fiduciary duty
fiduciary responsibility
fiduciary relationship
act as a fiduciary

Example sentences

"The board of directors was sued for breaching their fiduciary duty to the shareholders by investing in a risky venture owned by the CEO's brother." A legal dispute over corporate management.
"When choosing a financial advisor, it is wise to select one who operates as a fiduciary, meaning they are legally bound to put your interests first." A financial planning guide.

Memory hook

Think of 'fid' as 'faith' or 'trust' (like the Marine Corps motto, Semper Fi - always faithful). A fiduciary is someone who must remain absolutely faithful to your financial trust. The sacred trust of assets.

When not to use

Do not use fiduciary as a general synonym for 'financial'. While many fiduciary relationships are financial (like a fund manager), the word specifically denotes the legal and ethical relationship of trust, not just the money itself.

Fun facts

In Roman law, a 'fiducia' was an agreement where a debtor transferred property to a creditor on the condition that it would be returned once the debt was paid, establishing an early form of trust.