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index option

 
 
noun [C] ( also stock-index option)

Definition

FINANCE an investment based on the value of a stock index (= a set of shares that shows the value of a stock market). The investor buys the right to buy or sell that index at a particular price by a date in the future: S&P 500 Index Options The fund invested in equity index options.
(Definition of index option noun from the Cambridge Business English Dictionary © Cambridge University Press)

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