From Longman Dictionary of Contemporary Englishprice indexˈprice ˌindex noun [countable] PEa list of particular goods and services and how much their prices change each month → retail price index
Examples from the Corpus
price index• The government will report its December consumer price index on Feb. 1.• Salaries are rising barely as fast as the consumer price index, meaning most families do not have more buying power.• The consumer price index would have come a day later.• The account pays interest at 4.5% gross over the headline retail price index.• The value of these stocks is uprated each year in line with changes in the retail price index. 