Com·mer·cial a.  Of or pertaining to commerce; carrying on or occupied with commerce or trade; mercantile; as, commercial advantages; commercial relations. “Princely commercial houses.”
  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 7½ 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.
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  commercial paper
       n : an unsecured and unregistered short-term obligation issued
           by an institutional borrower to investors who have
           temporarily idle cash