Law . a person to whom property or power is entrusted for the benefit of another.

Law . of or pertaining to the relation between a fiduciary and his or her principal

a fiduciary capacity; a fiduciary duty.

of, based on, or in the nature of trust and confidence, as in public affairs

a fiduciary obligation of government employees.

depending on public confidence for value or currency, as fiat money.

noun

curator , depositary , guardian , trustee