The preferred plural is indexes. Use indices when you mean “indicators.” Scientists and mathematicians, however, prefer indices in technical writing.
Example: The author compiled the indexes for his various books, most discussing various indices of climate change.
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indexes, indices
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"indexes, indices." Grammar.com. STANDS4 LLC, 2024. Web. 8 Dec. 2024. <https://www.grammar.com/indexes-indices>.
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