noun Economics.
the automatic adjustment of wages, taxes, pension benefits, interest rates, etc., according to changes in the cost of living or another economic indicator, especially to compensate for inflation.

index + -ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
indexation or index-linking (ˌɪndɛkˈseɪʃən)
the act of making wages, interest rates, etc, index-linked
index-linking or index-linking

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It gave rise to cuts in inventory and inheritance taxes, and to the indexation
  of state income-tax rates to inflation.
Those who do index often have the right to suspend indexation, or partially
  index, in some years.
Indexation with the latter measure would result in changes in indexed benefits
  paralleling the spendable earnings of wage earners.
Indexation prevents inflation from causing bracket creep, and this reduces the
  strength of the revenue response to inflation.
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