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}, {atomic number 18}]
     2: a unit of surface area equal to 100 square meters [syn: {are}]
     3: a state in south central United States; one of the
        Confederate states during the American Civil War [syn: {Arkansas},
         {Land of Opportunity}]
Source: WordNet® 2.0

AR
     Administrative Request [message] (LFAP)
     
     
Source: Virtual Entity of Relevant Acronyms