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We found 21 dictionaries with English definitions that include the word thirties:
Click on the first link on a line below to go directly to a page where "thirties" is defined.

General (19 matching dictionaries)

1. thirties: Merriam-Webster.com [home, info]
2. thirties: Oxford Dictionaries [home, info]
3. thirties, the thirties: Collins English Dictionary [home, info]
4. thirties: Vocabulary.com [home, info]
5. Thirties, thirties: Wordnik [home, info]
6. thirties, the thirties: Cambridge Advanced Learner's Dictionary [home, info]
7. thirties: Wiktionary [home, info]
8. thirties: Dictionary.com [home, info]
9. thirties: UltraLingua English Dictionary [home, info]
10. thirties: Cambridge Dictionary of American English [home, info]
11. Thirties: Wikipedia, the Free Encyclopedia [home, info]
12. Thirties: Online Plain Text English Dictionary [home, info]
13. thirties: Rhymezone [home, info]
14. Thirties: AllWords.com Multi-Lingual Dictionary [home, info]
15. thirties: Free Dictionary [home, info]
16. thirties: Mnemonic Dictionary [home, info]
17. thirties: WordNet 1.7 Vocabulary Helper [home, info]
18. thirties: LookWAYup Translating Dictionary/Thesaurus [home, info]
19. thirties: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

20. thirties: Encyclopedia [home, info]

Slang (1 matching dictionary)

21. thirties: Urban Dictionary [home, info]

(Note: See thirtys for more definitions.)

Quick definitions from WordNet (thirties) ▸ noun:  the time of life between 30 and 40 ▸ noun:  the decade from 1930 to 1939 ▸ Also see thirtys ▸ Words similar to thirties ▸ Usage examples for thirties ▸ Popular adjectives describing thirties ▸ Words that often appear near thirties ▸ Rhymes of thirties ▸ Invented words related to thirties