Usually means: Radius in circular or spherical contexts.
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We found 19 dictionaries that define the word R:

General (8 matching dictionaries)
  1. r: Longman Dictionary of Contemporary English
  2. r: Merriam-Webster
  3. 'R, 'r, -r: Wordnik
  4. -r: The Wordsmyth English Dictionary-Thesaurus
  5. R(D), R(t): Dictionary.com
  6. R-, R. (album), R (James Bond), R (Los Angeles Railway), R (New York City Subway service), R (cable operator), R (complexity), R (cross section ratio), R (disambiguation), R (film), R (language), R (programming language), R (software), The r: Wikipedia, the Free Encyclopedia
  7. R: Stammtisch Beau Fleuve Acronyms
  8. R: Wiktionary

Art (1 matching dictionary)
  1. Virginia Tech Multimedia Music Dictionary (No longer online)

Business (1 matching dictionary)
  1. r (letter): Financial dictionary

Computing (1 matching dictionary)
  1. /r, r (letter): Encyclopedia

Medicine (4 matching dictionaries)
  1. R: Merriam-Webster Medical Dictionary
  2. R (symbol): MedTerms.com Medical Dictionary
  3. R-, r (letter): Medical dictionary
  4. R (symbol): Drug Medical Dictionary

Miscellaneous (2 matching dictionaries)
  1. R(D), R(t): Acronym Finder
  2. AbbreviationZ (No longer online)

Science (1 matching dictionary)
  1. R-: Eric Weisstein's World of Mathematics

Slang (1 matching dictionary)
  1. The R: Urban Dictionary

(Note: See r's as well.)

Definitions from Wiktionary (R)

noun:  (entomology) radius
noun:  (monarchy) rex (“king”) or regina (“queen”); the initial by which a British monarch signs documents after his or her name
noun:  (handbells) ring
noun:  (chess) rook
noun:  (baseball, cricket) runs, the statistic reporting the number of runs scored by a player
noun:  (law) the Crown, the government of a monarchy (abbreviating rex (“king”) or regina (“queen”))
noun:  (especially in university catalogs) Thursday
noun:  (Philippines) region, in the sense of the regions of the Philippines
adjective:  (film certification) restricted
adjective:  reverse
adjective:  right (as opposed to left)
noun:  (religion) In the context of the documentary hypothesis, the Redactor(s) who compiled and edited the Torah.
verb:  (Internet slang, text messaging) Abbreviation of are.
noun:  (US politics) Abbreviation of Republican, especially preceding the constituent location. [(US politics) A member or supporter of the Republican Party, the more right-wing of the two main political parties in the United States.]

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