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We found 29 dictionaries with English definitions that include the word thirtieth:
Click on the first link on a line below to go directly to a page where "thirtieth" is defined.

General (28 matching dictionaries)

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

Computing (1 matching dictionary)

27. thirtieth: Encyclopedia [home, info]

(Note: See thirtys for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (thirtieth) ▸ noun:  position 30 in a countable series of things ▸ adjective:  coming next after the twenty-ninth in position ▸ Also see thirtys ▸ Words similar to thirtieth ▸ Usage examples for thirtieth ▸ Idioms related to thirtieth (New!) ▸ Popular adjectives describing thirtieth ▸ Popular nouns described by thirtieth ▸ Words that often appear near thirtieth ▸ Rhymes of thirtieth ▸ Invented words related to thirtieth