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|Look up Aar or AAR in Wiktionary, the free dictionary.|
AAR or Aar may refer to:
- AAR Corporation, an American aviation engineering company
- "Air-to-air refueling", also known as aerial refueling, the practice of transferring fuel from one aircraft to another during flight
- AAR, IATA airport code for Aarhus Airport in Tirstrup, Denmark
- AAR, ICAO airline code for Asiana Airlines of South Korea
- Average accounting return, a capital budgeting investment rule
- Adam's apple reduction, a surgery
- After action review, a structured review process used by the U.S. military
- After action report, military terminology
- The All-American Rejects, an American rock band
- All American Racers, a former Formula 1 and CART team
- Allens, a law firm (formerly known as Allens Arthur Robinson)
- 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
- Arizona Association Realtors, a group representing the Real Estate brokers in the state of Arizona
Television and radio
- Air America Radio, a domestic United States radio network
- Afar language (ISO 639 language identification code)
- All-American Road, a designation for some national scenic byways in the United States
- Ann Arbor Railroad (disambiguation)
- AAR coupling
- "At any rate": see List of SMS abbreviations
- Amino acid response, the biochemical response of a mammalian cell starved of amino acids.
- Aar, a fictional planet of the star Deneb, in the "Captain Future" stories.
- 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, also in the basin of the Lahn
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