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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 (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
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
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
See also
- Ahr, a river in Germany, tributary of the Rhine
- Aare (disambiguation)
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