Fid-doo-she-air-ee. What the heck is a fiduciary, let alone a fiduciary duty? “Fiduciary” means trust. A fiduciary duty is the legal responsibility to act solely in the best interest of another party. A person with a fiduciary duty has a legal obligation to maintain that trust. For example, lawyers have a fiduciary duty to act in the best interest of their clients.    Read the article…………………………….