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English definition of “call option”

call option

noun [C]     (also call)
FINANCE, STOCK MARKET an agreement that gives an investor the right to buy a particular number of shares, or other financial assets, at a fixed price and before a fixed date: The company's call options were among the most actively traded.use/exercise a call option If you wish to exercise your call option, call your broker and he or she will make the necessary arrangements.
(Definition of call option noun from the Cambridge Business English Dictionary © Cambridge University Press)
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