Fiduciary
Fiduciary: A person who must act in another's best interest, such as a trustee or agent.

What fiduciary means
In short, fiduciary is a term you will meet in court papers, rules and legal research. The definition above gives its usual meaning in American civil practice. However, the exact meaning can depend on the rule, statute or court decision that uses it. So it helps to read the term in context.
Where fiduciary comes up
The term is used across many kinds of cases. For example, you may see it in pleadings, motions and court orders. To see it in context, browse the motions and procedures library or the Learn the Law topics.
How to research the term
To research fiduciary, begin with the rule, statute or contract where the word is used. Each one can give it a slightly different meaning. Then compare that text with how courts in your area have applied it. Also check the local rules of your court, since they can add requirements. If your case is in state court, the state rules control. So start with our state procedures guide to find them. In the end, always confirm that the source you rely on is current.
You can read the current federal court rules online for free.
Related legal terms
- Evidence: testimony, documents and things offered to prove or disprove facts.
- Excusable neglect: a standard courts use to decide whether to excuse a missed deadline or mistake, considering the circumstances.
- Final judgment: a judgment that ends the litigation on the merits and leaves nothing for the court to do but execute it. Most appeals can be taken only from final judgments.
- Financing statement: a filing (often called a UCC-1) that gives public notice of a security interest under UCC Article 9.
Why precise terms matter
Courts read legal terms closely. As a result, knowing the exact meaning of a word helps you follow orders, rules and filings. Each glossary entry on Lawtopolis is short on purpose and links to the pages where the term is used.
Sources
Sources last reviewed: 2026-10-23
Lawtopolis provides legal information and education, not legal advice. Using this site does not create an attorney-client relationship. Laws and court rules vary by jurisdiction and change over time; verify every authority against the official source and consult a licensed attorney in your jurisdiction about your situation.
