A trading order that is canceled unless executed within a designated time period. A market or limited price order that is to be executed in its entirety as soon as it is represented in the trading crowd, and, if not so executed, is to be treated as canceled. For purposes of this definition, a stop is considered an execution. Equivalent to AON and IOC simultaneously. Bloomberg Financial Dictionary
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An order submitted to the order book with a specified size and at the option of the member firm, a specified limit price which either executes in its entirety against eligible orders at the price of those orders or is rejected in full from the order book. Exchange Handbook Glossary
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An order submitted to the electronic order book with a specified size and, at the option of the member firm, a specified limit price which either executes in full against eligible orders at the price of those orders or is rejected in full from the order book. London Stock Exchange Glossary
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fill or kill order UK US noun [C] (ABBREVIATION FOK) STOCK MARKET
► an instruction to a broker (= someone who buys and sells shares, etc. for other people) to buy or sell particular stocks or shares immediately: »
But unlike a fill or kill order, it isn't cancelled if it's not executed immediately.
Financial and business terms. 2012.