In text, AHA can mean to "come to a realization" about something (or as an Expression of discovery).
AHA may also stand for the following:
American Heart Association
American Hospital Association
American Historical Association
Alpha Hydroxy Acid
Arabian Horse Association (Aurora, Colorado)
American Humane Association
American Humanist Association
American Hardboard Association (Palatine, Illinois)
American Homebrewers Association
American Homeowners Association
Australian Healthcare Association
American Homeschool Association
American Hippotherapy Association
American Hereford Association
Artists Helping Artists
Activity Hazard Analysis
American Hyperlexia Association
African Humanitarian Action
American Hypnosis Association
Anesthesia History Association
Ammunition Holding Area
Animal Health Act (UK)
Academy of the Holy Angels
Antihyperglycemic Agent
Area Hazard Analysis
Air Alpha Greenland (ICAO code)
Alert Holding Area (Army definition)
Anger Hostility Aggression
American Hardwood Association
Arrived Holding Area
American Helicopter Association
Animal Health Auxiliary
Albert Hydeman Associates
Alberta Handgun Association
Analog Headend Assembly
Assembly Hazard Analysis
Automated Historical Archives
Airport Handling Agents