noun
a point of reference or standard
adjective
relating to or based on trust or confidence
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The fiducial markers were placed precisely to ensure accurate measurements during the experiment.
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Make sure you put the fiducial stickers in the right spots before taking the photos.
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I totally trust that fiducial guy to handle all the financial stuff for me.
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The lighthouse served as a fiducial point for sailors navigating the treacherous waters.