AER or Aer may refer to:
Biology
- Aerides, an orchid genus, abbreviated Aer
- Agranular endoplasmic reticulum, a cell organelle
- Apical ectodermal ridge, critical component of vertebrate limb development
- Albumin Excretion Rate
Finance
- Annual equivalent rate, a notational interest rate
- Average earnings ratio, in stocks
- Administrative expense ratio, a ratio of general and administrative expenses to total revenue
Languages
- Aer language, an Indo-Aryan language of Pakistan
- Eastern Arrernte language, an Arandic dialect cluster of Australia (ISO-639: aer)
Music
- Aer (band), a hip-hop band
- Aer (album), an album by Swiss pianist and composer Nik Bärtsch's band Mobile
Organizations
- A.E.R. (automobile), a French former car manufacturer
- AER (motorcycles), a British motorcycle manufacturer
- Action For Economic Reforms, a public-interest research organization in the Philippines
- Advanced Engine Research, an endurance racing car engine manufacturer
- AerCap, an aircraft lessor (NYSE stock symbol AER)
- Aer Lingus, airline from Ireland
- Agri-Energy Roundtable, a non-governmental organization accredited by the United Nations
- Alberta Energy Regulator
- Algoma Eastern Railway, a former Canadian railway that operated in the province of Ontario
- Annual Equivalent Rate, as used in the UK
- Atmospheric and Environmental Research, an American scientific research agency owned by Verisk Analytics
- Army Emergency Relief
- Assembly of European Regions, an independent network of European Regions
- Australian Energy Regulator
Places
- Aer (Sendai), a skyscraper in Japan
- Sochi International Airport, Russia (IATA airport code)
Publications
- All England Law Reports, covering the court system in England and Wales
- American Economic Review
Religion and mythology
- Aër, a liturgical item in the Greek Orthodox Church
- Air (classical element), in Greek mythology
Other uses
- Address-Event Representation, a coordinate-based data format for sparse events in space-time.
- AER: Memories of Old, a 2017 adventure video game developed by Forgotten Key and published by Daedalic Entertainment
- All-electric range, the driving range of a vehicle using only electrical energy for propulsion
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