Source : Webster's Revised Unabridged Dictionary (1913)

Commercial \Com*mer"cial\, a. [Cf. F. commercial.]
   Of or pertaining to commerce; carrying on or occupied with
   commerce or trade; mercantile; as, commercial advantages;
   commercial relations. ``Princely commercial houses.''
   --Macaulay.

   {Commercial college}, a school for giving instruction in
      commercial knowledge and business.

   {Commercial law}. See under {Law}.

   {Commercial note paper}, a small size of writing paper,
      usually about 5 by 71/2 or 8 inches.

   {Commercial paper}, negotiable paper given in due course of
      business. It includes bills of exchange, promissory notes,
      bank checks, etc.

   {Commercial traveler}, an agent of a wholesale house who
      travels from town to town to solicit orders.

   Syn: See {Mercantile}.

Source : WordNet®

commercial paper
     n : an unsecured and unregistered short-term obligation issued
         by an institutional borrower to investors who have
         temporarily idle cash