what is a market order
Order (exchange) An order is an instruction to buy or sell on a trading venue such as a stock market, bond market, commodity market, or financial derivative market. These instructions can be simple or complicated, and can be sent to either a broker or directly to a trading venue via direct market access.
InvestorWords.com - Online Investing Glossary. A buy or sell order in which the broker is to execute the order at the best price currently available. also called at the market. These are often the lowest-commission trades because they involve very little work by the broker.