ar ar /ˈɑːr/

noun

1. A unit of surface area equal to 100 square meters  ( ar , are )
   a unit of surface area equal to 100 square meters
   

 AR

1. A state in south central United States; one of the Confederate states during the American Civil War  ( AR , Ark. , Land of Opportunity , Arkansas )
   a state in south central United States; one of the Confederate states during the American Civil War
     They went hiking in the beautiful forests of Arkansas.
   They went hiking in the beautiful forests of Arkansas.
   
   

 Ar

1. A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere  ( Ar , atomic number 18 , argon )
   a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
     Argon is an inert gas commonly used in light bulbs.
   Argon is an inert gas commonly used in light bulbs.