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We found 19 dictionaries with English definitions that include the word 12:
Click on the first link on a line below to go directly to a page where "12" is defined.

General (13 matching dictionaries)

1. 12: Vocabulary.com [home, info]
2. 12: Macmillan Dictionary [home, info]
3. 12: Wordnik [home, info]
4. 12: Dictionary.com [home, info]
5. 12: Rhymezone [home, info]
6. 12: Stammtisch Beau Fleuve Acronyms [home, info]
7. 12: Free Dictionary [home, info]
8. 12: Mnemonic Dictionary [home, info]
9. 12: WordNet 1.7 Vocabulary Helper [home, info]
10. 12: LookWAYup Translating Dictionary/Thesaurus [home, info]
11. 12: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

12. 12: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

13. 12: Acronym Finder [home, info]

Religion (1 matching dictionary)

14. 12: Postmodern Bible Dictionary [home, info]

Science (1 matching dictionary)

15. 12: Eric Weisstein's World of Mathematics [home, info]

Tech (2 matching dictionaries)

16. 12: Basics of Space Flight Glossary [home, info]
17. 12: Book Binding [home, info]

(Note: See twelves for more definitions.)

Quick definitions from WordNet (12) ▸ noun:  the cardinal number that is the sum of eleven and one ▸ adjective:  denoting a quantity consisting of 12 items or units ▸ Also see twelves ▸ Words similar to 12 ▸ Usage examples for 12 ▸ Idioms related to 12 (New!) ▸ Popular adjectives describing 12 ▸ Popular nouns described by 12 ▸ Words that often appear near 12 ▸ Rhymes of 12 ▸ Invented words related to 12