index number

noun

Statistics.

1. a quantity whose variation over a period of time measures the change in some phenomenon.

index number

noun

1. statistics 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

Word History and Origins

Origin of index number¹

First recorded in 1870–75