AR

from WordNet (r) 3.0 (2006)

Ar
    n 1: a colorless and odorless inert gas; one of the six inert
         gases; comprises approximately 1% of the earth's atmosphere
         [syn: {argon}, {Ar}, {atomic number 18}]
    2: a unit of surface area equal to 100 square meters [syn:
       {are}, {ar}]
    3: a state in south central United States; one of the
       Confederate states during the American Civil War [syn:
       {Arkansas}, {Land of Opportunity}, {AR}]

from The Collaborative International Dictionary of English v.0.48

Ar \Ar\, conj.
   Ere; before. [Obs.] --Chaucer.
   [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

ar

   <networking> The {country code} for Argentina.

   (1999-01-27)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

AR
       Administrative Request [message] (LFAP)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

AR
       Augmented Reality

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

AR
       Aperture Ratio (DVD)

from Hitchcock's Bible Names Dictionary (late 1800's)

Ar, awakening; uncovering