Fidiciary \Fi*di"ci*a*ry\ (? or ?), 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. 2. Holding, held, or founded, in trust. --Spelman.