price index

an index of the changes in the prices of goods and services, based on the prices of the same goods and services at a period arbitrarily selected as a base, usually expressed as 100.

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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price index

an index that traces the relative changes in the price of an individual good (or a market basket of goods) over time 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
So it is particularly instructive to look this week at our own commodity price index.
The search giant is working on its own price index based on online shopping.
We've adjusted all figures for inflation, using the consumer price index.
Tuition even outpaced a special price index deployed by colleges to help defend themselves against mounting criticism.
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