AskDefine | Define fiducial

Dictionary Definition

fiducial adj
1 relating to or of the nature of a legal trust (i.e. the holding of something in trust for another); "a fiduciary contract"; "in a fiduciary capacity"; "fiducial power" [syn: fiduciary]
2 used as a fixed standard of reference for comparison or measurement; "a fiducial point"
3 based on trust

User Contributed Dictionary



From Latin fiducialis, from fiducia (trust), derived from fidere (to trust).



  1. Accepted as a fixed basis of reference.
  2. Based on having trust.


accepted as a fixed basis of reference (1) base on having trust (2)


fiducial, plural fiducials
  1. In manufacturing, a small mark on a circuit board used to align components.
    Sometimes referred to as a fiducial point.

Extensive Definition

  • In applications of augmented reality or virtual reality, "'fiducials'" are often manually applied to objects in the scenery to recognize these objects in images of the scenery. For example, to track some object, a light emitting diode can be applied to it. With the knowledge of the color of the emitted light, the object can easily be identified in the picture.
  • In printed circuit board (PCB) design, "fiducial" marks, also known as circuit pattern recognition marks, allow automated assembly equipment to accurately locate and place parts on boards. These equipment locate the circuit pattern by providing common measurable points. They are usually made by leaving a spot of the board bare with a bare copper-, nickel-, or solder-coated dot inside.
  • In color printing "fiducials" -- also called "registration black" -- are used at the edge of the cyan, magenta, yellow and black (CMYK) printing plates so that they can be correctly aligned with each other.
  • In electrocardiography "fiducial" points are landmarks on the ECG complex such as the isoelectric line (PQ junction), and onset of individual waves such as PQRST.
  • In radiotherapy "fiducial" points are landmarks in the tumour so that treatment targets the correct area of the body.
  • In law the term "fiducial" means "of or pertaining to a fiduciary".

Synonyms, Antonyms and Related Words

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