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Part One: “It’s Not About the Money” (Of course not).
The Oxford Dictionary defines the origin of the concept and word “fiduciary” thusly:
late 16th century (in the sense ‘something inspiring trust; credentials’) : from Latin fiduciarius, from fiducia ‘trust’, from fidere ‘to trust’
The online Legal Dictionary defines “Fiduciary” as (emphasis mine):
1) n. from the Latin fiducia, meaning “trust,” a person (or a business like a bank or stock brokerage) who has the power and obligation to act for another (often called the beneficiary) under circumstances which require total trust, good faith and honesty. The most common is a trustee of a trust, but fiduciaries can include business advisers, attorneys, guardians, administrators of estates, real estate agents, bankers, stockbrokers, title companies or anyone who undertakes to assist someone who places complete confidence and trust in that person or company. Characteristically, the fiduciary has greater knowledge and expertise about the matters being handled.
A fiduciary is held to a standard of conduct and trust above that of a stranger or of a casual business person. He/she/it must avoid “self-dealing” or “conflicts of interests” in which the potential benefit to the fiduciary is in conflict with what is best for the person who trusts him/her/it. For example, a stockbroker must consider the best investment for the client and not buy or sell on the basis of what brings him/her the highest commission. While a fiduciary and the beneficiary may join together in a business venture or a purchase of property, the best interest of the beneficiary must be primary, and absolute candor is required of the fiduciary.
2) adj. defining a situation or relationship in which a person is acting as a fiduciary for another.

Wiki entry: Fiduciary – The Fiduciary Relationship is seen to be based on complete trust, and the Fiduciary is expected to act with complete loyalty and only in the best interests of the client – even if that conflicts with what is in the best interests of the Fiduciary. (more…)