(adj) relating to or of the nature of a legal trust (i.e. the holding of something in trust for another), Syn. fiducial, Example:a fiduciary contract; in a fiduciary capacity; fiducial power
a. [ L. fiduciarus, fr. fiducia: cf. F. fiduciaire. See Fiducial. ] 1. Involving confidence or trust; confident; undoubting; faithful; firm; as, in a fiduciary capacity. “Fiduciary obedience.” Howell. [ 1913 Webster ]
2. Holding, held, or founded, in trust. Spelman. [ 1913 Webster ]