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We found 30 dictionaries with English definitions that include the word eighteenth:
Click on the first link on a line below to go directly to a page where "eighteenth" is defined.

General (27 matching dictionaries)

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

Art (1 matching dictionary)

26. Eighteenth: Encyclopedia of Organ Stops [home, info]

Computing (1 matching dictionary)

27. eighteenth: Encyclopedia [home, info]

Medicine (1 matching dictionary)

28. eighteenth: online medical dictionary [home, info]

(Note: See eighteens for more definitions.)

Quick definitions from WordNet (eighteenth) ▸ noun:  position 18 in a countable series of things ▸ adjective:  coming next after the seventeenth in position ▸ Also see eighteens ▸ Words similar to eighteenth ▸ Usage examples for eighteenth ▸ Idioms related to eighteenth (New!) ▸ Popular adjectives describing eighteenth ▸ Popular nouns described by eighteenth ▸ Words that often appear near eighteenth ▸ Rhymes of eighteenth ▸ Invented words related to eighteenth