Source : Webster's Revised Unabridged Dictionary (1913)

Trust \Trust\, n.
   1. An equitable right or interest in property distinct from
      the legal ownership thereof; a use (as it existed before
      the Statute of Uses); also, a property interest held by
      one person for the benefit of another. Trusts are active,
      or special, express, implied, constructive, etc. In a

   {passive trust} the trustee simply has title to the trust
      property, while its control and management are in the
      beneficiary.

   2. A business organization or combination consisting of a
      number of firms or corporations operating, and often
      united, under an agreement creating a trust (in sense 1),
      esp. one formed mainly for the purpose of regulating the
      supply and price of commodities, etc.; often,
      opprobriously, a combination formed for the purpose of
      controlling or monopolizing a trade, industry, or
      business, by doing acts in restraint or trade; as, a sugar
      trust. A trust may take the form of a corporation or of a
      body of persons or corporations acting together by mutual
      arrangement, as under a contract or a so-called
      gentlemen's agreement. When it consists of corporations it
      may be effected by putting a majority of their stock
      either in the hands of a board of trustees (whence the
      name trust for the combination) or by transferring a
      majority to a holding company. The advantages of a trust
      are partly due to the economies made possible in carrying
      on a large business, as well as the doing away with
      competition. In the United States severe statutes against
      trusts have been passed by the Federal government and in
      many States, with elaborate statutory definitions.

Source : WordNet®

passive trust
     n : a trust in which the trustee performs no active duties [ant:
          {active trust}]