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Fiducial

1. Having faith or trust; confident; undoubting; firm. Fiducial reliance on the promises of god.

2. Having the nature of a trust; fiduciary; as, fiducial power.

(Science: astronomy) fiducial edge, the straight edge of the alidade or ruler along which a straight line is to be drawn.

(Science: mathematics) fiducial line or point, a line or point of reference, as for setting a graduated circle or scale used for measurments.

Origin: L. Fiducia trust, confidence; akin to fides faith. See Faith.