We found 27 dictionaries that define the word quadrillion:

General (21 matching dictionaries)

1. quadrillion: Longman Dictionary of Contemporary English
2. quadrillion: Merriam-Webster
3. quadrillion: Oxford Learner's Dictionaries
4. quadrillion: American Heritage Dictionary of the English Language
5. quadrillion: Collins English Dictionary
6. quadrillion: Vocabulary.com
7. Quadrillion, quadrillion: Wordnik
8. quadrillion: Wiktionary
9. quadrillion: Webster's New World College Dictionary, 4th Ed.
10. quadrillion: The Wordsmyth English Dictionary-Thesaurus
11. quadrillion: Infoplease Dictionary
12. Quadrillion, quadrillion: Dictionary.com
13. quadrillion: Online Etymology Dictionary
14. Quadrillion: Wikipedia, the Free Encyclopedia
15. Quadrillion: Online Plain Text English Dictionary
16. quadrillion: Webster's Revised Unabridged, 1913 Edition
17. quadrillion: Rhymezone
18. Quadrillion: AllWords.com Multi-Lingual Dictionary
19. quadrillion: FreeDictionary.org
20. quadrillion: Mnemonic Dictionary
21. quadrillion: TheFreeDictionary.com

Business (1 matching dictionary)

22. Quadrillion: Energy Dictionary

Computing (2 matching dictionaries)

23. quadrillion: CCI Computer
24. quadrillion: Encyclopedia

Science (2 matching dictionaries)

25. Quadrillion: Eric Weisstein's World of Mathematics
26. quadrillion: MATH SPOKEN HERE!

Slang (1 matching dictionary)

27. QUADRILLION: Urban Dictionary

(Note: See quadrillions as well.)

Definitions from Wiktionary (quadrillion) ▸ noun:  (figuratively, slang, hyperbolic) Any very large number, exceeding normal description. Similar: quintillion, umptillion, jillion, squillion, jajillion, jazillion, zillion, wazillion, zabillion, nonillion, more... Types: one millionth, one billionth, one trillionth, one quadrillionth, more... ▸ Word origin ▸ Words similar to quadrillion ▸ Usage examples for quadrillion ▸ Idioms related to quadrillion ▸ Wikipedia articles (New!) ▸ Popular adjectives describing quadrillion ▸ Words that often appear near quadrillion ▸ Rhymes of quadrillion ▸ Invented words related to quadrillion