Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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-ar1 of or pertaining to. [2 definitions]
-ar2 one that acts as an agent or performs.
Ar symbol of the chemical element argon.
AR abbreviation of "Arkansas," a south central U.S. state between Mississippi and Oklahoma.
Arkansas a south central U.S. state between Mississippi and Oklahoma. (abbr.: AR)