Relating to or of the nature of a legal trust (i.e. the holding of something in trust for another):
— Fiducial power.

synonym: fiduciary.

Roget 150: unchangeable, immutable; unaltered, unalterable; not to be changed, constant; permanent etc. 141; invariable, undeviating; stable, durable; perennial etc. (diuturnal) 110^†.    fixed, steadfast, firm, fast, steady, balanced; confirmed, valid; fiducial^†; immovable, irremovable, riveted, rooted; settled, established etc. v.; vested; incontrovertible, stereotyped, indeclinable.    tethered, anchored, moored, at anchor, on a rock, rock solid, firm as a rock; firmly seated, firmly established etc. v.; deep-rooted, ineradicable; inveterate; obstinate etc. 606.    transfixed, stuck fast, aground, high and dry, stranded.    [movable object rendered unmovable] stuck, jammed; unremovable; quiescent etc. 265; deterioration etc. 659.    indefeasible, irretrievable, intransmutable^†, incommutable^†, irresoluble^†, irrevocable, irreversible, reverseless^†, inextinguishable, irreducible; indissoluble, indissolvable^†; indestructible, undying, imperishable, incorruptible, indelible, indeciduous^†; insusceptible, insusceptible of change.    ... show more

Roget 484: believing etc. v.; certain, sure, assured, positive, cocksure, satisfied, confident, unhesitating, convinced, secure.    under the impression; impressed with, imbued with, penetrated with.    confiding, suspectless^†; unsuspecting, unsuspicious; void of suspicion; credulous etc. 486; wedded to.    believed etc. v.; accredited, putative; unsuspected.    worthy of, deserving of, commanding belief; credible, reliable, trustworthy, to be depended on; satisfactory; probably etc. 472; fiducial^†, fiduciary; persuasive, impressive.    relating to belief, doctrinal.    ... show more

Used as a fixed standard of reference for comparison or measurement.

Based on trust.