Noun : a true index of his character. ,index of growth; index of intelligence. ,an Index of disapproved books relating to Communism.    From Dictionary.com. 

Verb (used with object) : warm breezes indexing the approach of spring. ,The commissar insisted on indexing the book.    From Dictionary.com. 

The other possibility is to go indexless via differential forms.    From Wordnik.com.  [Backreaction] Reference