Definition of index verb from the Oxford Advanced Learner's Dictionary

      

    index

     verb
    verb
    BrE BrE//ˈɪndeks//
     
    ; NAmE NAmE//ˈɪndeks//
     
    Verb Forms present simple I / you / we / they index
    BrE BrE//ˈɪndeks//
     
    ; NAmE NAmE//ˈɪndeks//
     
    he / she / it indexes
    BrE BrE//ˈɪndeksɪz//
     
    ; NAmE NAmE//ˈɪndeksɪz//
     
    past simple indexed
    BrE BrE//ˈɪndekst//
     
    ; NAmE NAmE//ˈɪndekst//
     
    past participle indexed
    BrE BrE//ˈɪndekst//
     
    ; NAmE NAmE//ˈɪndekst//
     
    -ing form indexing
    BrE BrE//ˈɪndeksɪŋ//
     
    ; NAmE NAmE//ˈɪndeksɪŋ//
     
     
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  1. 1index something to make an index of documents, the contents of a book, etc.; to add something to a list of this type All publications are indexed by subject and title. New material is scanned, indexed and stored electronically.
  2. 2[usually passive] index something (to something) to link wages, etc. to the level of prices of food, clothing, etc. so that they both increase at the same rate
  3. Word Origin late Middle English: from Latin index, indic- ‘forefinger, informer, sign’, from in- ‘towards’ + a second element related to dicere ‘say’ or dicare ‘make known’; compare with indicate. The original sense ‘index finger’ (the finger with which one points), came to mean ‘pointer’ (late 16th cent.), and figuratively something that serves to point to a fact or conclusion; hence a list of topics in a book (“pointing” to their location).
See the Oxford Advanced American Dictionary entry: index