by trade

: the business of buying and selling or bartering commodities : commerce

: business, market

: dealings between persons or groups

: to give one thing in exchange for another

: to engage in the exchange, purchase, or sale of goods

: to make one's purchases : shop

: of, relating to, or used in trade

: intended for or limited to persons in a business or industry

: serving others in the same business rather than the ultimate user or consumer