1. (

• argon ,
• Ar ,
• atomic_number_ ,

) 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 ,
• Ark.

) a state in south central United States; one of the Confederate states during the American Civil War ;