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adj. 1. Based on or relating to faith or trust. 2. Relating to or characteristic of a legal trust; fiduciary. 3. Regarded or employed as a standard of reference, as in surveying. [Late Latin fīdūciālis, from Latin fīdūcia, trust, from fīdere, to trust; see bheidh- in the Appendix of Indo-European roots.] fi·ducial·ly adv. |
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