index fund

American  

noun

1. a fund, as a mutual fund or pension fund, with a portfolio that contains many of the securities listed in a major stock index in order to match the performance of the stock market generally.

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Etymology

Origin of index fund

First recorded in 1975–80

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Example Sentences

See Examples For:

index fund

So an argument can be made that your S&P 500 index fund isn’t as diversified as its name makes it out to be.

From MarketWatch ● Nov. 2, 2026

That fund sports a 3.1% expense ratio, 100 times the cost of an S&P 500 index fund.

From The Wall Street Journal ● Oct. 23, 2026

But beyond that, I’d say an index fund.

From MarketWatch ● Oct. 22, 2026

So the city's funds would "automatically become long-term investors when the company is integrated into the index fund," a spokesperson for the Comptroller's office said.

From Barron's ● Oct. 15, 2026

Just buying and holding a plain vanilla index fund is hard too.

From The Wall Street Journal ● Oct. 13, 2026

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