| Acronym | Definition |
|---|
| AET | Aetna, Inc. |
| AET | After Extra Time |
| AET | Aetatis (Latin: Of Age) |
| AET | Actual Evapotranspiration |
| AET | Applied Extrusion Technologies, Inc. |
| AET | Alliance for Environmental Technology |
| AET | Africa Educational Trust (London, UK) |
| AET | Assistant English Teacher |
| AET | Alpha-Ethyltryptamine |
| AET | Apparent Effects Threshold |
| AET | Application Entity Title |
| AET | Affective Events Theory |
| AET | Alternate Energy Technologies, LLC (Jacksonville, FL) |
| AET | Advanced Engine Technology (Canada) |
| AET | Avionics Electrical Technician (US Coast Guard) |
| AET | Atrial Ectopic Tachycardia |
| AET | Aminoethylisothiouronium (radiation protection agent) |
| AET | American Engineering Testing, Inc |
| AET | Antimicrobial Effectiveness Testing |
| AET | Apports Energétiques Totaux (French: Total Energy Intake) |
| AET | Advanced Extraction Technologies, Inc |
| AET | Annual Ethics Training |
| AET | Allakaket, AK, USA (Airport Code) |
| AET | Actual Evapo-Transpiration |
| AET | Army Extension Training |
| AET | Aerospace Engineering Technician |
| AET | Acoustic Emission Technique |
| AET | Aircrew Egress Trainer |
| AET | Associated Environmental Trainer (NETA) |
| AET | Allowable Elapsed Time |
| AET | Ascent Ephemeris Tape |
| AET | Automatic Equipment Test (Sprint) |
| AET | Asynchronous Encodings in Tandem |
| AET | Algorithm Evaluation and Test |
| AET | Aeromedical Evacuation Technician |
| AET | Aerosurface End-to-end Test |
| AET | Accelerated Environmental Test |
| AET | Action Extreme Team (USA network show) |
| AET | Association of Electrical Technologists (Purdue University; Indiana) |
| AET | Atelier Européen de la Traduction (French: European Translation Workshop) |
| AET | Adjuvant Endocrine Therapy (women's health) |
| AET | Association Européenne de Terminologie (French: European Association for Terminology; Brussels, Belgium) |
| AET | Advanced Energy Technology (various locations) |
| AET | Aide à l'Enfance Tibétaine (French: Help Tibetan Children) |