An order which, if not executed during the trading session the day it is entered, automatically expires at the end of the session. All orders are assumed to be day orders unless specified otherwise. The CENTER ONLINE Futures Glossary
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In the context of general equities, request from a customer to either buy or sell stock, that, if not canceled or executed the day it is placed, expires automatically. All orders are day orders unless otherwise specified. traders often make calls before the opening to check for renewals. Bloomberg Financial Dictionary
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An order that is placed for execution during only one trading session. If the order cannot be executed that day, it is automatically canceled. Order is good from ETH through RTH. Chicago Mercantile Exchange Glossary
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An order placed for execution, if possible, during only one trading session. If the order cannot be executed that day, it is automatically cancelled. Exchange Handbook Glossary
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Automatically expires at the end of the day's standard market trading session if it is not filled. NYSE Euronext Glossary
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day order UK US noun [C]
► STOCK MARKET an order to buy or sell shares, etc. on a particular day. After that day, they can no longer be bought or sold: »
Unless you give your broker other instructions, orders to buy or sell a stock will be treated as day orders.
Financial and business terms. 2012.