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We found 33 dictionaries with English definitions that include the word rr:
Click on the first link on a line below to go directly to a page where "rr" is defined.

General (16 matching dictionaries)

1. RR: Merriam-Webster.com [home, info]
2. RR: Oxford Learner's Dictionaries [home, info]
3. RR: American Heritage Dictionary of the English Language [home, info]
4. RR: Collins English Dictionary [home, info]
5. RR: Macmillan Dictionary [home, info]
6. RR, Rr, rr, rr, rR: Wordnik [home, info]
7. RR, -rr-, rr: Cambridge Advanced Learner's Dictionary [home, info]
8. R.R, RR: Wiktionary [home, info]
9. RR: Webster's New World College Dictionary, 4th Ed. [home, info]
10. RR: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. R.R: Infoplease Dictionary [home, info]
12. R.R, RR: Dictionary.com [home, info]
13. RR (New York City Subway service), RR (debugging), RR (disambiguation), RR (film), RR, Rr (debugging), Rr (digraph), Rr: Wikipedia, the Free Encyclopedia [home, info]
14. RR, RR: Stammtisch Beau Fleuve Acronyms [home, info]
15. RR: Dictionary/thesaurus [home, info]

Business (3 matching dictionaries)

16. RR, RR: Travel Industry Dictionary [home, info]
17. RR: Investopedia [home, info]
18. RR: Comprehensive Financial [home, info]

Computing (6 matching dictionaries)

19. RR: Netlingo [home, info]
20. RR: CCI Computer [home, info]
21. RR: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]
22. RR: SMS Dictionary [home, info]
23. RR: I T Glossary [home, info]
24. RR: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

25. RR: Hepatitis C Information Central [home, info]
26. RR: Medical dictionary [home, info]

Miscellaneous (3 matching dictionaries)

27. RR, RR, RR: Terminology and Descriptions of Geneaological Words [home, info]
28. RR-, RR: Acronym Finder [home, info]
29. R.R, RR: AbbreviationZ [home, info]

Slang (1 matching dictionary)

30. rr, rr: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

31. RR: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]
32. RR: Glossary of Insulator Terms [home, info]

Quick definitions from Wiktionary (Rr) ▸ verb:  (aviation, travel, dated) (from the status code used in the GDS) reconfirm / reconfirmed. ▸ noun:  (US) Initialism of railroad. [(chiefly US) A permanent track consisting of fixed metal rails to drive trains or similar motorized vehicles on.] ▸ noun:  (cycling) Initialism of road race. [A race run on roads rather than a track.] ▸ noun:  Initialism of Rolls-Royce. [any of several British companies that make motor cars, aero engines, etc.] ▸ noun:  Initialism of reverse racism. [(sociology) Racism against the racial majority (either a member or group of that majority or the majority in general).] ▸ noun:  Initialism of real reality. [Reality, the real world, that which is not virtual nor augmented nor an online world] ▸ noun:  (statistics, epidemiology) Initialism of relative risk. ▸ noun:  (US) Initialism of rural route used when addressing mail. ▸ noun:  Abbreviation of Roraima, a state of Brazil. [a large tepui located at the junction of Guyana, Venezuela, and Brazil] ▸ Words similar to rr ▸ Usage examples for rr ▸ Idioms related to rr (New!) ▸ Popular adjectives describing rr ▸ Words that often appear near rr ▸ Rhymes of rr ▸ Invented words related to rr