Origin of fiducial
Related formsfi·du·cial·ly, adverbun·fi·du·cial, adjective
Examples from the Web for fiducial
It is upon this focusing-screen in the roof that I see the fiducial lines by which I make all the adjustments.
Fiducial, fi-dū′shi-al, adj. showing confidence or reliance: of the nature of a trust.
It gives, in short, the average tint of every unit of area in the picture, measured from the fiducial lines as co-ordinates.
These lines are our fiducial lines, and all colours can be referred to them.Colour Measurement and Mixture|W. de W. Abney
The cistern should not, however, require adjustment to a zero or fiducial point.A Treatise on Meteorological Instruments|Henry Negretti