AMA is used as an abbreviation for the following:

• Academy of Model Aeronautics
• Alberta Motor Association
• American Management Association
• American Medical Association
• American Motorcyclist Association
• American Music Awards
• Associación Médica Argentina
• Australia Medical Association
• Against medical advice - a patient that leaves a medical facility early and against the advice of medical staff.
• Agence Mondiale Antidopage, or the World Anti-Doping Agency

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AMA can also mean

• Actual mechanical advantage