Editorial
Fiduciary duty
Definition
A duty owed by someone who has undertaken to act for or on behalf of another in circumstances giving rise to a relationship of trust and confidence. Its distinguishing obligation is loyalty: the fiduciary must not profit from the position or allow duty and interest to conflict.
In plain English: If someone is trusted to act for you, they must put your interests first and not quietly profit from the job.
A general definition, not tied to any jurisdiction. Check the meaning in the system that governs your matter before relying on it.