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Noun ar has 3 senses
  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
    --1 is a kind of chemical element, element; noble gas, inert gas, argonon
    --1 is a substance of air
  2. are, ar - a unit of surface area equal to 100 square meters
    --2 is a kind of area unit, square measure
    --2 is a part of hectare
  3. Arkansas, Land of Opportunity, AR - a state in south central United States; one of the Confederate states during the American Civil War
    --3 is a kind of American state
    --3 is a part of
     United States, United States of America, America, US, U.S., USA, U.S.A.
     --3 is a member of
     Confederacy, Confederate States, Confederate States of America, South, Dixie, Dixieland
     --3 has parts:
     Hot Springs National Park; Fayetteville; Fort Smith; Hot Springs; Jonesboro; Little Rock, capital of Arkansas; Pine Bluff; Texarkana; Arkansas, Arkansas River; Ouachita, Ouachita River; Ozarks, Ozark Mountains, Ozark Plateau; Saint Francis, Saint Francis River, St. Francis, St. Francis River; White, White River
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