What does "commercial" mean?

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 7½ or 8 inches. -- Commercial paper, negotiable paper given in due course of business. It includes bills of exchange, promissory notes, bank cheks, etc. -- Commercial traveler, an agent of a wholesale house who travels from town to town to solicit orders.