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We found 31 dictionaries with English definitions that include the word quadrillion:
Click on the first link on a line below to go directly to a page where "quadrillion" is defined.

General (25 matching dictionaries)

1. quadrillion: Merriam-Webster.com [home, info]
2. quadrillion: Oxford Dictionaries [home, info]
3. quadrillion: American Heritage Dictionary of the English Language [home, info]
4. quadrillion: Collins English Dictionary [home, info]
5. quadrillion: Vocabulary.com [home, info]
6. Quadrillion, quadrillion: Wordnik [home, info]
7. quadrillion: Wiktionary [home, info]
8. quadrillion: Webster's New World College Dictionary, 4th Ed. [home, info]
9. quadrillion: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. quadrillion: Infoplease Dictionary [home, info]
11. Quadrillion, quadrillion: Dictionary.com [home, info]
12. quadrillion: Online Etymology Dictionary [home, info]
13. quadrillion: UltraLingua English Dictionary [home, info]
14. Quadrillion: Wikipedia, the Free Encyclopedia [home, info]
15. Quadrillion: Online Plain Text English Dictionary [home, info]
16. quadrillion: Webster's Revised Unabridged, 1913 Edition [home, info]
17. quadrillion: Rhymezone [home, info]
18. Quadrillion: AllWords.com Multi-Lingual Dictionary [home, info]
19. quadrillion: Hutchinson's Dictionary of Difficult Words [home, info]
20. quadrillion: Free Dictionary [home, info]
21. quadrillion: Hutchinson Dictionaries [home, info]
22. quadrillion: Mnemonic Dictionary [home, info]
23. quadrillion: WordNet 1.7 Vocabulary Helper [home, info]
24. quadrillion: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. quadrillion: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

26. Quadrillion: Energy Dictionary [home, info]

Computing (2 matching dictionaries)

27. quadrillion: CCI Computer [home, info]
28. quadrillion: Encyclopedia [home, info]

Science (2 matching dictionaries)

29. Quadrillion: Eric Weisstein's World of Mathematics [home, info]
30. quadrillion: MATH SPOKEN HERE! [home, info]

Slang (1 matching dictionary)

31. QUADRILLION: Urban Dictionary [home, info]

(Note: See quadrillionth for more definitions.)

Quick definitions from WordNet (quadrillion) ▸ noun:  the number that is represented as a one followed by 15 zeros ▸ noun:  the number that is represented as a one followed by 24 zeros ("In England they call a septillion a quadrillion") ▸ Also see quadrillionth ▸ Word origin ▸ Words similar to quadrillion ▸ Usage examples for quadrillion ▸ Popular adjectives describing quadrillion ▸ Words that often appear near quadrillion ▸ Rhymes of quadrillion ▸ Invented words related to quadrillion