fiduciary >> fɪˈdjuːʃ(ə)ri
Definition: [adjective] involving trust, especially with regard to the relationship between a trustee and a beneficiary.
Example: the company has a fiduciary duty to shareholders
Definition: [adjective] (of a paper currency) depending for its value on securities (as opposed to gold) or the reputation of the issuer.
Definition: [noun] a trustee.