{{Wiktionary|Aar|AAR}}
'''AAR''' or '''Aar''' may refer to: {{TOC right}}
==Aviation== * AAR Corporation, an American aviation engineering company * Air-to-air refueling, the process of transferring aviation fuel from one military aircraft to another during flight * IATA airport code for Aarhus Airport in Mid Jutland Region, Denmark * ICAO airline code for Asiana Airlines of South Korea
==Geography== *Aar, a river in Switzerland, tributary of the Rhine *Aar (Lahn), a tributary of Lahn river in Germany, descending from the Taunus mountains *Aar (Dill), a tributary of Dill river in Germany, also in the basin of the Lahn *Aar (Ill), a branch of the Ill river that separates from it in Strasbourg, France and rejoins it further north *Aar (Twiste), a tributary of Twiste river in Germany, in the basin of the Weser *Aar (village), a village in Rajasthan, India *South American–Antarctic Ridge, also known as the American–Antarctic Ridge, a mid-ocean ridge in the South Atlantic *Antarctica, IAAF code AAR
==Military== * After-action review, a structured review process used by the U.S. military * After action report, a retrospective analysis * Assistant Automatic Rifleman, a soldier who carries ammunition, see Rifleman#Modern_tactics.
==Organizations== *All American Racers, a former Formula 1 and CART team *Allens (law firm), a law firm (formerly known as Allens Arthur Robinson) *American Academy in Rome, research and arts institution in Rome *American Academy of Religion, an association of academics who research or teach topics related to religion *Association for Automated Reasoning, a non-profit that seeks to advance the field of automated reasoning *Association of American Railroads, an industry trade group representing the railroads of North America
==Transportation== *AAR coupling, railway coupling specification of the Association of American Railroads *AAR wheel arrangement, Association of American Railroads system for describing wheel arrangement of locomotives *All-American Road, a designation for some national scenic byways in the United States *Ann Arbor Railroad (disambiguation)
==Other uses== *Aar (Star Wars), fictional planet in ''Star Wars'' universe *Aar, a fictional planet of the star Deneb, in the "Captain Future" stories *The All-American Rejects, an American rock band *Air America Radio, a domestic United States radio network *Average accounting return, a capital budgeting investment rule *Adam's apple reduction, a surgery *Afar language (ISO 639 language identification code) *''African American Review'', a journal *Amino acid response, the biochemical response of a mammalian cell starved of amino acids *"At any rate", see List of SMS abbreviations *Alkali–aggregate reaction, a chemical reaction leading to expansion in concrete
==See also== *Ahr, a river in Germany, tributary of the Rhine *Aare (disambiguation)
{{Disambiguation|geo}}