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We found 16 dictionaries with English definitions that include the word 21:
Click on the first link on a line below to go directly to a page where "21" is defined.

General (11 matching dictionaries)

1. 21: Vocabulary.com [home, info]
2. 2.1: Macmillan Dictionary [home, info]
3. 21: Wordnik [home, info]
4. 21: Dictionary.com [home, info]
5. 21: Rhymezone [home, info]
6. 21: Free Dictionary [home, info]
7. 21: Mnemonic Dictionary [home, info]
8. 21: WordNet 1.7 Vocabulary Helper [home, info]
9. 21: LookWAYup Translating Dictionary/Thesaurus [home, info]

Computing (1 matching dictionary)

10. 21, 21 (number): Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

11. 21: Acronym Finder [home, info]

Slang (2 matching dictionaries)

12. 21: American-Australian Slang Dictionary [home, info]
13. The 21: Urban Dictionary [home, info]

Sports (1 matching dictionary)

14. 21: Card Games [home, info]

Quick definitions from WordNet (21) ▸ noun:  the cardinal number that is the sum of twenty and one ▸ adjective:  being one more than twenty ▸ Words similar to 21 ▸ Usage examples for 21 ▸ Idioms related to 21 (New!) ▸ Popular adjectives describing 21 ▸ Popular nouns described by 21 ▸ Words that often appear near 21 ▸ Rhymes of 21 ▸ Invented words related to 21