Source : Webster's Revised Unabridged Dictionary (1913)

   {Collateral assurance}, that which is made, over and above
      the deed itself.

   {Collateral circulation} (Med. & Physiol.), circulation
      established through indirect or subordinate branches when
      the supply through the main vessel is obstructed.

   {Collateral issue}. (Law)
      (a) An issue taken upon a matter aside from the merits of
          the case.
      (b) An issue raised by a criminal convict who pleads any
          matter allowed by law in bar of execution, as pardon,
          diversity of person, etc.
      (c) A point raised, on cross-examination, aside from the
          issue fixed by the pleadings, as to which the answer
          of the witness, when given, cannot subsequently be
          contradicted by the party asking the question.

   {Collateral security}, security for the performance of
      covenants, or the payment of money, besides the principal
      security,