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fiducial (adj.)

1570s, "assumed as a fixed basis for comparison," from Latin fiducialis "reliable," from fiducia "trust" (from PIE root *bheidh- "to trust, confide, persuade"). From 1620s as "pertaining to trust;" 1832 as "fiduciary."

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Definitions of fiducial from WordNet

fiducial (adj.)
based on trust;
fiducial (adj.)
relating to or of the nature of a legal trust (i.e. the holding of something in trust for another);
fiducial power
Synonyms: fiduciary
fiducial (adj.)
used as a fixed standard of reference for comparison or measurement;
a fiducial point
From wordnet.princeton.edu