CPI is defined as an abbreviation for the Consumer Price Index, a measure of inflation taken monthly by the U.S. Department of Commerce, that reports price changes in over 200 categories including the costs of products, services and taxes.(abbreviation)
An example of the CPI is a Chained CPI which is cutting an entitement, such as Social Security, by using a measurement that shows a slower rate of inflation than used in other CPI inflation measurements.
See cpi in Webster's New World College Dictionary
See cpi in American Heritage Dictionary 4
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