price index

noun
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.

Origin:
1885–90

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
price index

noun
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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00:10
Price index is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
the offspring of a zebra and a donkey.
Example sentences
Tuition even outpaced a special price index deployed by colleges to help defend themselves against mounting criticism.
So it is particularly instructive to look this week at our own commodity price index.
We've adjusted all figures for inflation, using the consumer price index.
The search giant is working on its own price index based on online shopping.
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