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fiduciary

/fih-DOO-shee-er-ee/ noun, adjective

1A person trusted to act in someone else's best interest, or relating to that trust

Fiduciary Meaning: Who Holds Your Trust and What They Owe You

Business and moneyNoun and adjectiveLaw and moneyUpdated 26 Oct 2026

The fiduciary meaning centres on trust: a fiduciary is a person or organisation that must look after another person's money, property or interests and put that person's interests ahead of their own. A trustee managing an estate for children, or a guardian handling a minor's savings, is acting as a fiduciary.

As an adjective, fiduciary describes anything built on that trust, as in fiduciary duty or a fiduciary relationship. You will meet the word in law, banking, investing and company governance. What follows covers a working definition, the duties involved, everyday examples and the word's Latin roots.

Entry at a glance

  • Meaning

    Someone legally bound to act in another's best interest; relating to such trust
  • Part of speech

    Noun and adjective
  • Pronunciation

    fih-DOO-shee-er-ee (US); fih-DYOO-shuh-ree (UK)
  • Plural

    fiduciaries
  • Origin

    Latin fiduciarius, held in trust, from fiducia, trust
  • Common pairings

    fiduciary duty, fiduciary relationship, fiduciary capacity, breach of fiduciary duty
  • Register

    Formal, legal and financial

Fiduciary definition in everyday language

To define fiduciary plainly: it is the role of someone you are allowed to rely on completely when they handle something of yours. Because you cannot watch every decision they make, the law expects them to act honestly, carefully and only for your benefit. The person who receives that protection is often called the beneficiary or the principal.

Two features mark a fiduciary relationship. First, one side has power or control over the other's assets or affairs. Second, the other side depends on them and is vulnerable if that power is misused. That is why the standard is higher than in an ordinary business deal, where each side is expected to look after itself.

What a fiduciary duty involves

The details vary by country and by role, but most legal systems group fiduciary duties under a few headings:

  • Loyalty. Act for the beneficiary, not for yourself. Avoid conflicts of interest, and do not make secret profits from the role.
  • Care. Make decisions with reasonable skill and attention, the way a careful person would.
  • Good faith and honesty. Be truthful and disclose information the beneficiary needs.
  • Accounting. Keep records and be ready to show how money or property was handled.

When a fiduciary ignores these duties, the beneficiary may sue for breach of fiduciary duty. Courts can order the fiduciary to repay losses or hand over any profit they made. The values behind these duties are explored on the integrity and accountability pages.

This is general information, not legal or financial advice. Rules on fiduciary duties differ between countries and roles, so ask a qualified lawyer or adviser about your own situation.

Who counts as a fiduciary?

FiduciaryActs forWhat they manage
TrusteeBeneficiaries of a trustTrust money and property
Executor of a willHeirsThe estate of someone who has died
GuardianA child or an adult who cannot decide alonePersonal and financial affairs
Company directorThe company and its shareholdersBusiness decisions
Agent with power of attorneyThe person who appointed themWhatever the document allows

Some financial advisers are fiduciaries and some are not; it depends on the type of licence and local rules in the US, India and elsewhere. It is reasonable to ask an adviser directly whether they act as a fiduciary for you.

Fiduciary meaning in sentences

  • As executor, my aunt has a fiduciary duty to share the estate fairly among all of us.
  • The board was accused of breaching its fiduciary obligations by approving the deal without enough checks.
  • Before hiring a planner, ask whether they will act in a fiduciary capacity.
  • The bank holds the funds as a fiduciary until the sale is complete.
Your elderly neighbour gives her nephew power of attorney to pay her bills. If he uses her savings to buy himself a car, he has broken a fiduciary duty, because the role was given to him to serve her interests, not his own.

Fiduciary money and other uses

In economics, fiduciary money means money whose value rests on people's trust that others will accept it, rather than on the metal or material it is made of. Banknotes are the classic example. The word also appears in phrases such as fiduciary account (an account managed by one party for another) and fiduciary relationship between doctor and patient or lawyer and client, where the professional is expected to put the client first. For more money terms, visit our business and money hub.

Origin of the word fiduciary

Fiduciary entered English in the 1600s from Latin fiduciarius, meaning entrusted or held in trust. That word comes from fiducia, trust or confidence, which in Roman law also named a kind of property transfer made in trust. The deeper root is fidere, to trust, which also sits behind fidelity, confide and affidavit. So the word has always carried the sense of faith placed in another person.

Mistakes to avoid

Spell it with -ciary, not -cuary or -tiary. Do not treat fiduciary as a job title on its own; it is a legal status attached to a role. And remember that being paid does not cancel the duty. Many fiduciaries charge fees, but they must still act in the beneficiary's interest, disclose the fees and avoid hidden conflicts.

Frequently asked questions

What is a fiduciary, in short?

A fiduciary is someone trusted to manage money, property or decisions for another person and required to act in that person's best interest. Trustees, executors and guardians are common examples.

How do you say fiduciary?

Most Americans say fih-DOO-shee-er-ee, five syllables with stress on DOO. British speakers often say fih-DYOO-shuh-ree, with a y sound after the d.

What is a breach of fiduciary duty?

It happens when a fiduciary fails to act loyally, carefully or honestly for the person they serve, for example by taking a hidden profit or ignoring a clear conflict of interest. The person harmed may be able to claim compensation in court.

Is every financial adviser a fiduciary?

No. Whether an adviser owes a fiduciary duty depends on their licence, the service they provide and the rules of the country. Asking the question in writing before you sign up is a sensible step.

Can fiduciary describe a person and a duty?

It works as either. The noun form refers to the trusted person (the fiduciary). As an adjective it describes the duty or relationship (fiduciary duty, fiduciary role).

What is the plural of fiduciary?

The plural is fiduciaries. For example, a family trust may have two or three fiduciaries who must agree on major decisions.