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WordReference Random House Unabridged Dictionary of American English © 2024in′dex num′ber, [Statistics.]- Statisticsa quantity whose variation over a period of time measures the change in some phenomenon. Also called index.
Collins Concise English Dictionary © HarperCollins Publishers:: index number n - a statistic indicating the relative change occurring in each successive period of time in the price, volume, or value of a commodity or in a general economic variable, such as the price level, national income, or gross output, with reference to a previous base period conventionally given the number 100
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