WordReference Random House Unabridged Dictionary of American English © 2025
index num′ber, [Statistics.]
  1. Statisticsa quantity whose variation over a period of time measures the change in some phenomenon. Also called index. 
  • 1870–75

Collins Concise English Dictionary © HarperCollins Publishers::
index number
  1. 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
'index number' also found in these entries (note: many are not synonyms or translations):

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