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We found 25 dictionaries with English definitions that include the word magic number:
Click on the first link on a line below to go directly to a page where "magic number" is defined.

General (18 matching dictionaries)

1. magic number: Merriam-Webster.com [home, info]
2. magic number: Oxford Dictionaries [home, info]
3. magic number: American Heritage Dictionary of the English Language [home, info]
4. magic number: Collins English Dictionary [home, info]
5. magic number: Vocabulary.com [home, info]
6. magic number: Macmillan Dictionary [home, info]
7. magic number: Wiktionary [home, info]
8. magic number: Infoplease Dictionary [home, info]
9. magic number: Dictionary.com [home, info]
10. magic number: UltraLingua English Dictionary [home, info]
11. Magic number (chemistry), Magic number (physics), Magic number (programming), Magic number (sports), Magic number, The Magic Number: Wikipedia, the Free Encyclopedia [home, info]
12. magic number: Rhymezone [home, info]
13. magic number: Free Dictionary [home, info]
14. magic number: Mnemonic Dictionary [home, info]
15. magic number: LookWAYup Translating Dictionary/Thesaurus [home, info]
16. magic number: Dictionary/thesaurus [home, info]

Computing (2 matching dictionaries)

17. magic number: Free On-line Dictionary of Computing [home, info]
18. magic number: Encyclopedia [home, info]

Medicine (1 matching dictionary)

19. magic number: online medical dictionary [home, info]

Science (3 matching dictionaries)

20. Magic Number: Eric Weisstein's World of Mathematics [home, info]
21. Magic Number: Eric Weisstein's World of Physics [home, info]
22. Magic Number: Extragalactic Astronomy [home, info]

Slang (1 matching dictionary)

23. magic number: Urban Dictionary [home, info]

(Note: See magic_numbers for more definitions.)

Quick definitions from WordNet (magic number) ▸ noun:  the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126 ▸ Also see magic_numbers ▸ Words similar to magic number ▸ Words that often appear near magic number ▸ Rhymes of magic number ▸ Invented words related to magic number