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

General (26 matching dictionaries)

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

Business (1 matching dictionary)

25. millionth: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

26. millionth: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

27. millionth: Idioms [home, info]

Science (1 matching dictionary)

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

(Note: See millions for more definitions.)

Quick definitions from WordNet (millionth) ▸ noun:  position 1,000,000 in a countable series of things ▸ noun:  one part in a million ▸ adjective:  the ordinal number of one million in counting order ▸ Also see millions ▸ Words similar to millionth ▸ Usage examples for millionth ▸ Idioms related to millionth (New!) ▸ Popular adjectives describing millionth ▸ Popular nouns described by millionth ▸ Words that often appear near millionth ▸ Rhymes of millionth ▸ Invented words related to millionth