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WordNet (r) 3.0 (2006) (WordNet)

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