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We found 34 dictionaries with English definitions that include the word usa:
Click on the first link on a line below to go directly to a page where "usa" is defined.

General (24 matching dictionaries)

1. USA: Merriam-Webster.com [home, info]
2. USA: Oxford Learner's Dictionaries [home, info]
3. USA: American Heritage Dictionary of the English Language [home, info]
4. U.S.A, USA: Collins English Dictionary [home, info]
5. U.S.A, USA: Vocabulary.com [home, info]
6. the U.S.A: Macmillan Dictionary [home, info]
7. U.S.A, USa, Usa, usa: Wordnik [home, info]
8. the USA, the usa: Cambridge Advanced Learner's Dictionary [home, info]
9. U.S.A: Wiktionary [home, info]
10. USA: Webster's New World College Dictionary, 4th Ed. [home, info]
11. USA: Infoplease Dictionary [home, info]
12. USA(RET), USA, u.s.a: Dictionary.com [home, info]
13. USA: UltraLingua English Dictionary [home, info]
14. usa: Cambridge Dictionary of American English [home, info]
15. The USA, The Usa, U.S.A, U.S.A. (Da Pump song), U.S.A. (Flatlinerz album), U.S.A. (United State of Atlanta), U.S.A. (trilogy), USA (Anamanaguchi album), USA (King Crimson album), USA (TV network), USA (Unconformable Social Amputees), USA (United State of Atlanta), USA (album), USA (band), USA (brand), USA (disambiguation), USA (television), USA, USA, U.s.a, Usa (Germany), Usa: Wikipedia, the Free Encyclopedia [home, info]
16. U.s.a, Usa: Rhymezone [home, info]
17. USA: Stammtisch Beau Fleuve Acronyms [home, info]
18. u.s.a, usa: Free Dictionary [home, info]
19. u.s.a, usa: Mnemonic Dictionary [home, info]
20. u.s.a, usa: WordNet 1.7 Vocabulary Helper [home, info]
21. U.S.A, USA, usa: LookWAYup Translating Dictionary/Thesaurus [home, info]
22. U.S.A, USA, USA: Dictionary/thesaurus [home, info]

Art (2 matching dictionaries)

23. USA: Epicurus.com Wine Glossary [home, info]
24. USA: Glossary of Stamp Collecting Terms [home, info]

Computing (1 matching dictionary)

25. The USA, U.S.A, USA: Encyclopedia [home, info]

Miscellaneous (2 matching dictionaries)

26. USA(RET), USA: Acronym Finder [home, info]
27. USA: AbbreviationZ [home, info]

Science (2 matching dictionaries)

28. U.S.A: LITTLE EXPLORERS(TM) Picture Dictionary [home, info]
29. USA: A Dictionary of Quaternary Acronyms and Abbreviations [home, info]

Slang (1 matching dictionary)

30. U.S.A, U.S.A, the USA: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

31. USA: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING [home, info]
32. USA: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]

(Note: See usas for more definitions.)

Quick definitions from WordNet (Usa) ▸ noun:  the army of the United States of America; organizes and trains soldiers for land warfare ▸ noun:  North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776 ▸ Also see usas ▸ Words similar to usa ▸ Usage examples for usa ▸ Idioms related to usa (New!) ▸ Popular adjectives describing usa ▸ Words that often appear near usa ▸ Rhymes of usa ▸ Invented words related to usa