Relating to or based on trust and confidence, especially used in technical or scientific contexts to describe a reference point or measurement that can be relied upon as accurate.
Fiducial derives from Latin 'fiducia' (trust) with the addition of the English suffix '-al.' It entered English scientific vocabulary in the 17th century as a way to describe fixed reference points used in measurements and observations.
Scientists and engineers use 'fiducial marks' as trustworthy reference points—tiny dots or lines that they can absolutely rely on to be exact. It's trust itself turned into a measurement tool.
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