What is the meaning of Fiduciary?

Relating to an entity that owes to another good faith, accountability and trust, often in the context of trusts and trustees.

Pertaining to paper money whose value depends on public confidence or securities.

Accepted as a trusted reference such as a point, value, or marker; fiducial.

One who holds a thing in trust for another.

One who depends for salvation on faith, without works; an antinomian.

Source: wiktionary.org