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We found 27 dictionaries with English definitions that include the word quintillion:
Click on the first link on a line below to go directly to a page where "quintillion" is defined.

General (21 matching dictionaries)

1. quintillion: Merriam-Webster.com [home, info]
2. quintillion: Oxford Dictionaries [home, info]
3. quintillion: American Heritage Dictionary of the English Language [home, info]
4. quintillion: Collins English Dictionary [home, info]
5. quintillion: Vocabulary.com [home, info]
6. quintillion: Wordnik [home, info]
7. quintillion: Wiktionary [home, info]
8. quintillion: Webster's New World College Dictionary, 4th Ed. [home, info]
9. quintillion: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. quintillion: Infoplease Dictionary [home, info]
11. quintillion: Dictionary.com [home, info]
12. quintillion: Online Etymology Dictionary [home, info]
13. quintillion: UltraLingua English Dictionary [home, info]
14. Quintillion: Wikipedia, the Free Encyclopedia [home, info]
15. quintillion: Rhymezone [home, info]
16. quintillion: Hutchinson's Dictionary of Difficult Words [home, info]
17. quintillion: Free Dictionary [home, info]
18. quintillion: Hutchinson Dictionaries [home, info]
19. quintillion: Mnemonic Dictionary [home, info]
20. quintillion: LookWAYup Translating Dictionary/Thesaurus [home, info]
21. quintillion: Dictionary/thesaurus [home, info]

Computing (3 matching dictionaries)

22. quintillion: Free On-line Dictionary of Computing [home, info]
23. quintillion: CCI Computer [home, info]
24. quintillion: Encyclopedia [home, info]

Medicine (1 matching dictionary)

25. quintillion: online medical dictionary [home, info]

Science (1 matching dictionary)

26. Quintillion: Eric Weisstein's World of Mathematics [home, info]

Slang (1 matching dictionary)

27. quintillion: Urban Dictionary [home, info]

(Note: See quintillionth for more definitions.)

Quick definitions from WordNet (quintillion) ▸ noun:  the number that is represented as a one followed by 18 zeros ▸ Also see quintillionth ▸ Word origin ▸ Words similar to quintillion ▸ Usage examples for quintillion ▸ Popular adjectives describing quintillion ▸ Words that often appear near quintillion ▸ Rhymes of quintillion ▸ Invented words related to quintillion