We found 29 dictionaries that define the word eighteen:

General (25 matching dictionaries)

1. eighteen: Merriam-Webster
2. eighteen: Oxford Learner's Dictionaries
3. eighteen: American Heritage Dictionary of the English Language
4. eighteen: Collins English Dictionary
5. eighteen: Vocabulary.com
6. Eighteen, eighteen: Wordnik
7. eighteen: Cambridge Advanced Learner's Dictionary
8. Eighteen, eighteen: Wiktionary
9. eighteen: Webster's New World College Dictionary, 4th Ed.
10. eighteen: The Wordsmyth English Dictionary-Thesaurus
11. eighteen: Infoplease Dictionary
12. Eighteen, eighteen: Dictionary.com
13. eighteen: Cambridge Essential American English Dictionary
14. Eighteen (CLC song), Eighteen (Pale Waves song), Eighteen (film), Eighteen: Wikipedia, the Free Encyclopedia
15. Eighteen: Online Plain Text English Dictionary
16. eighteen: Webster's Revised Unabridged, 1913 Edition
17. eighteen: Rhymezone
18. eighteen: AllWords.com Multi-Lingual Dictionary
19. eighteen: Webster's 1828 Dictionary
20. eighteen: FreeDictionary.org
21. eighteen: Mnemonic Dictionary
22. eighteen: TheFreeDictionary.com
23. eighteen: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)

24. eighteen: Encyclopedia

Science (1 matching dictionary)

25. eighteen: MATH SPOKEN HERE!

Slang (2 matching dictionaries)

26. eighteen: Green’s Dictionary of Slang
27. eighteen: Urban Dictionary

(Note: See 18 as well.)

Definitions from Wiktionary ( ) ▸ noun:  A surname. Similar: cardinal, xviii, nineteen, sixteen, fourteen, thirteen, Seventeen, fifteen, twelve, twenty, more... Opposite: twelve, thirteen, fourteen, fifteen, sixteen Phrases: eighteen wheeler, eighteen wheelers, eighteen plus, At Eighteen, Eighteen Kingdoms, more... Adjectives: patient, part, nineteen, day, fourteen, two, last Colors:     lavender,     coral,     mint,     teal,     peach, more... ▸ Words similar to eighteen ▸ Usage examples for eighteen ▸ Idioms related to eighteen ▸ Wikipedia articles (New!) ▸ Popular adjectives describing eighteen ▸ Words that often appear near eighteen ▸ Rhymes of eighteen ▸ Invented words related to eighteen