[ fi-doo-shuh l, -dyoo- ]
/ fɪˈdu ʃəl, -ˈdyu- /


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

Origin of fiducial

1565–75; < Late Latin fīdūciālis, equivalent to fīdūci(a) trust (akin to fīdere to trust) + -ālis -al1

Related forms

fi·du·cial·ly, adverbun·fi·du·cial, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fiducial

British Dictionary definitions for fiducial


/ (fɪˈdjuːʃɪəl) /


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

Derived Forms

fiducially, adverb

Word Origin for fiducial

C17: from Late Latin fīdūciālis , from Latin fīdūcia confidence, reliance, from fīdere to trust
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012