A legal promise or guarantee made on faith or honor, especially one that binds someone to fulfill an obligation.
From Latin fides (faith) and promissio (promise), literally 'faith-promise.' This term emerged in Medieval Latin legal terminology to describe solemn commitments backed by one's reputation and honor rather than collateral.
This word shows how trust used to be the currency of contracts—before written law and courts became powerful, your word and your fides (reputation) were literally worth more than any document. Some cultures still operate this way today.
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