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The Collaborative International Dictionary of English v.0.48 (gcide)

Index \In"dex\, v. t. [imp. & p. p. {Indexed}; p. pr. & vb. n.
{Indexing}.]
1. To provide with an index or table of references; to put
into an index; as, to index a book, or its contents.
[1913 Webster]

2. (Economics) To adjust (wages, prices, taxes, etc.)
automatically so as to compensate for changes in prices,
usually as measured by the {consumer price index} or other
economic measure. Its purpose is usually to copensate for
inflation.
[PJC]

3. To insert (a word, name, file folder, etc.) into an index
or into an indexed arrangement; as, to index a contract
under its date of signing.
[PJC]