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

General (28 matching dictionaries)

1. eighteen: Merriam-Webster.com [home, info]
2. eighteen: Oxford Learner's Dictionaries [home, info]
3. eighteen: American Heritage Dictionary of the English Language [home, info]
4. eighteen: Collins English Dictionary [home, info]
5. eighteen: Vocabulary.com [home, info]
6. eighteen: Macmillan Dictionary [home, info]
7. Eighteen, eighteen: Wordnik [home, info]
8. eighteen: Cambridge Advanced Learner's Dictionary [home, info]
9. Eighteen, eighteen: Wiktionary [home, info]
10. eighteen: Webster's New World College Dictionary, 4th Ed. [home, info]
11. eighteen: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. eighteen: Infoplease Dictionary [home, info]
13. Eighteen, eighteen: Dictionary.com [home, info]
14. eighteen: UltraLingua English Dictionary [home, info]
15. eighteen: Cambridge Dictionary of American English [home, info]
16. Eighteen (CLC song), Eighteen (Pale Waves song), Eighteen (film), Eighteen: Wikipedia, the Free Encyclopedia [home, info]
17. Eighteen: Online Plain Text English Dictionary [home, info]
18. eighteen: Webster's Revised Unabridged, 1913 Edition [home, info]
19. eighteen: Rhymezone [home, info]
20. eighteen: AllWords.com Multi-Lingual Dictionary [home, info]
21. eighteen: Webster's 1828 Dictionary [home, info]
22. eighteen: Free Dictionary [home, info]
23. eighteen: Mnemonic Dictionary [home, info]
24. eighteen: WordNet 1.7 Vocabulary Helper [home, info]
25. eighteen: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. eighteen: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

27. eighteen: Encyclopedia [home, info]

Science (1 matching dictionary)

28. eighteen: MATH SPOKEN HERE! [home, info]

Slang (1 matching dictionary)

29. eighteen: Urban Dictionary [home, info]

(Note: See eighteenth for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (eighteen) ▸ noun:  the cardinal number that is the sum of seventeen and one ▸ adjective:  being one more than seventeen ▸ Also see eighteenth ▸ Words similar to eighteen ▸ Usage examples for eighteen ▸ Idioms related to eighteen (New!) ▸ Popular adjectives describing eighteen ▸ Popular nouns described by eighteen ▸ Words that often appear near eighteen ▸ Rhymes of eighteen ▸ Invented words related to eighteen