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We found 21 dictionaries with English definitions that include the word index number:
Click on the first link on a line below to go directly to a page where "index number" is defined.

General (16 matching dictionaries)

1. index number: Dictionary.com [home, info]
2. Index number: Wikipedia, the Free Encyclopedia [home, info]
3. index number: Rhymezone [home, info]
4. index number: Free Dictionary [home, info]
5. index number: Mnemonic Dictionary [home, info]
6. index number: WordNet 1.7 Vocabulary Helper [home, info]
7. index number: LookWAYup Translating Dictionary/Thesaurus [home, info]
8. index number: Dictionary/thesaurus [home, info]
9. index number: Merriam-Webster.com [home, info]
10. index number: American Heritage Dictionary of the English Language [home, info]
11. index number: Collins English Dictionary [home, info]
12. index number: Vocabulary.com [home, info]
13. index number: Macmillan Dictionary [home, info]
14. index number: Infoplease Dictionary [home, info]

Business (3 matching dictionaries)

15. Index number: Deardorff's Glossary of International Economics [home, info]
16. Index number: Accounting, Business Studies and Economics Dictionary [home, info]
17. index number: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

18. index number: Encyclopedia [home, info]

Science (1 matching dictionary)

19. Index Number: Eric Weisstein's World of Mathematics [home, info]

(Note: See index_numbers for more definitions.)

Quick definitions from WordNet (index number) ▸ noun:  a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time ▸ Also see index_numbers ▸ Words similar to index number ▸ Usage examples for index number ▸ Words that often appear near index number ▸ Rhymes of index number ▸ Invented words related to index number