Noun has 3 senses

• ar(n = noun.substance) argon, atomic number 18 - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere;



• ar(n = noun.quantity) are - a unit of surface area equal to 100 square meters;



• ar(n = noun.location) arkansas, land of opportunity - a state in south central United States; one of the Confederate states during the American Civil War;