(stock market) A type of stock market or financial derivative order, signifying that the order is to be presented for execution, and if not executed ("filled") immediately (traditionally within a few seconds) is to be cancelled.
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fill or kill - Investment & Finance Definition
customer order that must be filled immediately or cancelled. It also is a price
limit order, which means the trade must take place at a specific price or not
at all. It is used in different securities markets, including stock and futures