AAR

AAR or Aar may refer to:

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
• Air-to-air refueling, the process of transferring aviation fuel from one military aircraft to another during flight
• 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 Corporation, an American aviation engineering company
• 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)
• IATA airport code for Aarhus Airport in Tirstrup, Denmark
• ICAO airline code for Asiana Airlines of South Korea

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)