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We found 18 dictionaries that include the word 30:

General (11 matching dictionaries)

1. 30: Merriam-Webster.com [home, info]
2. 30: Vocabulary.com [home, info]
3. 30: Wordnik [home, info]
4. 30: Dictionary.com [home, info]
5. 30: Cambridge Dictionary of American English [home, info]
6. 30: Cambridge International Dictionary of Idioms [home, info]
7. 30: Rhymezone [home, info]
8. 30: Free Dictionary [home, info]
9. 30: Mnemonic Dictionary [home, info]
10. 30: WordNet 1.7 Vocabulary Helper [home, info]
11. 30: LookWAYup Translating Dictionary/Thesaurus [home, info]

Art (1 matching dictionary)

12. 30: Literary Terms [home, info]

Computing (1 matching dictionary)

13. 30, 30 (number): Encyclopedia [home, info]

Miscellaneous (2 matching dictionaries)

14. 30: Acronym Finder [home, info]
15. 30: AbbreviationZ [home, info]

Science (1 matching dictionary)

16. 30: Eric Weisstein's World of Mathematics [home, info]

Slang (2 matching dictionaries)

17. 30: Totally Unofficial Rap [home, info]
18. the 30: Urban Dictionary [home, info]

(Note: See thirtys for more definitions.)

Quick definitions from WordNet (30) ▸ noun:  the cardinal number that is the product of ten and three ▸ adjective:  being ten more than twenty ▸ Also see thirtys ▸ Words similar to 30 ▸ Usage examples for 30 ▸ Idioms related to 30 (New!) ▸ Popular adjectives describing 30 ▸ Popular nouns described by 30 ▸ Words that often appear near 30 ▸ Rhymes of 30 ▸ Invented words related to 30