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retail price index

noun
  1. (in Britain) a list, based on government figures and usually published monthly, that shows the extent of change in the prices of a range of goods selected as being essential items in the budget of a normal householdAbbreviation: RPI
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012