A person or organization legally bound to act in another party's best interest, putting the client's needs above their own. Fiduciaries have the highest standard of care and must avoid conflicts of interest.
From Latin 'fiduciarius' meaning 'held in trust,' derived from 'fides' (faith or trust). The legal concept developed in Roman law where certain relationships required absolute trust and loyalty, with severe penalties for betraying that sacred bond.
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