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