FIDUCIAL

fiducial

(adjective) based on trust

fiducial

(adjective) used as a fixed standard of reference for comparison or measurement; “a fiducial point”

fiduciary, fiducial

(adjective) 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”

Source: WordNet® 3.1

Etymology

Adjective

fiducial (comparative more fiducial, superlative most fiducial)

Accepted as a fixed basis of reference.

Based on having trust.

Noun

fiducial (plural fiducials)

In manufacturing, a small mark on a circuit board used to align components, a fiducial point.

Source: Wiktionary

Fi*du"cial, a. Etym: [L. fiducia trust, confidence; akin to fides faith. See Faith.]

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

2. Having the nature of a trust; fiduciary; as, fiducial power. Spelman. Fiducial edge (Astron. & Surv.), the straight edge of the alidade or ruler along which a straight line is to be drawn.

– Fiducial line or point (Math. & Physics.), a line or point of reference, as for setting a graduated circle or scale used for measurments.

Source: Webster’s Unabridged Dictionary 1913 Edition