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 for inverted index
From The Free On-line Dictionary of Computing (30 December 2018) :

  inverted index
      A sequence of ({key, pointer)
     pairs where each pointer points to a record in a database
     which contains the key value in some particular field.  The
     index is sorted on the key values to allow rapid searching for
     a particular key value, using e.g. binary search.  The index
     is "inverted" in the sense that the key value is used to find
     the record rather than the other way round.  For databases in
     which the records may be searched based on more than one
     field, multiple indices may be created that are sorted on
     those keys.
     An index may contain gaps to allow for new entries to be added
     in the correct sort order without always requiring the
     following entries to be shifted out of the way.

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