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."
fiducial power
a fiducial point
fiddlestick
fideism
fidelity
fidget
fidgety
fiducial
fiduciary
fie
fief
fiefdom
field
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