There are multiple definitions:

1. alpha-1-antitrypsin(English)

2. aneurysma aortae thoracale(Latin)

   • AAA, TAAA
   • Vascular disease

3. Actual Abuse Tool(English)

   • BASE, CABS, CAS, EASI, IOA, OAPAM, RAT, SAT, VASS

4. animal assisted therapy(English)

   • part of animal-assisted intervention. It is a goal-oriented, planned, and structured therapeutic intervention directed and/or delivered by health, education, and human service professionals with expertise within the scope of the professionals’ practice. Intervention progress is measured and included in professional documentation. The method focuses on enhancing physical, cognitive, behavioral and/or socio-emotional functioning of the particular human client
   • AAE, AAI
   • Therapeutic approaches, Education, Behavior(al science), Cognitive function, Social aspects
   • https://doi.org/10.5772/61117

5. alpha attenuation test(English)

   • a 12-min eye closed/open protocol, is a quantitative method based on the fact that EEG alpha (8-12 Hz) activity tends to increase with eyes open as individuals get sleepier, while it decreases with eyes closed
   • EEG
   • Electrophysiology, Sleep medicine
   • https://doi.org…678379508256574

6. atrial activation time(English)

   • CS, ECG, LA, RA
   • Electrophysiology, Cardiology
   • https://doi.org….1998.tb01156.x

7. Aachen aphasia test(English)

   • used to diagnose and describe aphasic disorders and can be used for aphasia sufferers of all etiologies
   • AABT, CIAT, CVA, ILAT
   • Aphasia, Neurology, Psychology
   • https://doi.org…688638508401268

8. arm abduction test(English)

   • MRND, NDII, PTC, QOL, TT
   • Diagnostics, Thyroid and parathyroid, Surgery
   • https://doi.org…10/jc.2013-1583