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Adjective: fiducial  fi'doo-shul or fI'doo-shul
  1. Relating to or of the nature of a legal trust (i.e. the holding of something in trust for another)
    "fiducial power";
    - fiduciary
  2. (physics) used as a fixed standard of reference for comparison or measurement
    "a fiducial point"
  3. Based on trust

See also: straight-up [informal], trustable, trustworthy, trusty

Encyclopedia: Fiducial