index fund
US /ˈɪn.deks ˌfʌnd/
UK /ˈɪn.deks ˌfʌnd/
1.
a type of mutual fund or exchange-traded fund (ETF) with a portfolio constructed to match or track the components of a market index, such as the S&P 500
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Investing in an index fund is often recommended for long-term growth.
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She prefers low-cost index funds over actively managed ones.