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We found 18 dictionaries with English definitions that include the word 18:
Click on the first link on a line below to go directly to a page where "18" is defined.

General (13 matching dictionaries)

1. 18: Vocabulary.com [home, info]
2. 18: Macmillan Dictionary [home, info]
3. 18: Wordnik [home, info]
4. 18: Cambridge Advanced Learner's Dictionary [home, info]
5. 18: Dictionary.com [home, info]
6. 18: Rhymezone [home, info]
7. 18: Free Dictionary [home, info]
8. 18: Mnemonic Dictionary [home, info]
9. 18: WordNet 1.7 Vocabulary Helper [home, info]
10. 18: LookWAYup Translating Dictionary/Thesaurus [home, info]
11. 18: Dictionary/thesaurus [home, info]

Art (1 matching dictionary)

12. 18: Literary Terms [home, info]

Computing (1 matching dictionary)

13. 18, 18 (number): Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

14. 18: Acronym Finder [home, info]

Science (1 matching dictionary)

15. 18: Eric Weisstein's World of Mathematics [home, info]

Tech (1 matching dictionary)

16. 18: Basics of Space Flight Glossary [home, info]

(Note: See eighteenth for more definitions.)

Quick definitions from WordNet (18) ▸ noun:  the cardinal number that is the sum of seventeen and one ▸ adjective:  being one more than seventeen ▸ Also see eighteenth ▸ Words similar to 18 ▸ Usage examples for 18 ▸ Popular adjectives describing 18 ▸ Popular nouns described by 18 ▸ Words that often appear near 18 ▸ Rhymes of 18 ▸ Invented words related to 18