At the best available price with no limit subject to the brokers discretion or the terms of execution.
An instruction to buy or sell at market price. Allows the broker/dealer complete freedom of action. Should be treated with caution and used only when a share must be sold.
A buying or selling order to be effected at current market prices. If you instruct a sell at market, your shares will be sold at the current highest bid, if you instruct to buy at market then you will buy at the current lowest selling price. Placing an at market order does not necessarily mean that your entire order will be filled, their needs to be sufficient shares on the bid/offer to fill your order. An 'at market' order will lock in the market price. See also
Purchase or sale at whatever price prevails at the time the transaction occurs
Instructions in a market order in which no price is specified. Such an order is to be executed at once at the best possible market price
See At best. Français: Au prix du marché Español: At market