Meaning of “stock index” in the English Dictionary

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"stock index" in Business English

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stock indexnoun [ C ]

uk us 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” from the Cambridge Business English Dictionary © Cambridge University Press)