A guarantor or surety; a person who acts as security for another person's debt or obligation, especially in Spanish or Latin American legal contexts.
From Spanish 'fiador,' derived from Latin 'fidare' meaning 'to trust' (related to 'fides,' meaning faith or trust). The word entered English legal and business vocabularies through Spanish colonial and commercial contact.
The word 'fiador' comes from the same Latin root as 'fiduciary' and 'fidelity'—all three words ultimately trace back to the concept of trust, which has always been the bedrock of lending and commerce.
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