Cambridge Learner's Dictionary
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Definition
index1 Show phoneticsnoun [C]
1 LIST plural indexes an alphabetical list of subjects or names at the end of a book, showing on what page they are found in the text
Look up 'heart disease' in the index.
2 INFORMATION plural indexes a collection of information stored on a computer or on cards in alphabetical order
3 SYSTEM plural indices or indexes a system for comparing different values and recording changes, especially in financial markets
the retail price index
