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English definition of “stock index”

stock index

noun [C]     (also stock market index, also share index) FINANCE, STOCK MARKET
a series of numbers that shows changes in the average prices of shares on a particular stock market over time: The Nikkei 225 stock index surged 2% last week The main stock index was down 350 points.
(Definition of stock index noun from the Cambridge Business English Dictionary © Cambridge University Press)
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