1. accepted as a fixed basis of reference or comparison: a fiducial point; a fiducial temperature.
  2. based on or having trust: fiducial dependence upon God.


  1. physics used as a standard of reference or measurementa fiducial point
  2. of or based on trust or faith
  3. law a less common word for fiduciary

1570s, from Latin fiducialis “reliable,” from fiducia “trust” (see faith).

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