| Acronym | Definition |
|---|
| ARI➣Ayn Rand Institute |
| ARI➣Air-Conditioning and Refrigeration Institute |
| ARI➣Autism Research Institute |
| ARI➣Asia Research Institute |
| ARI➣Acute Respiratory Infection |
| ARI➣Aberdeen Royal Infirmary |
| ARI➣Army Research Institute |
| ARI➣American Railcar Industries (St. Louis, MO) |
| ARI➣Applied Research Institute (various locations) |
| ARI➣Air Routing International (Rockwell Collins; Iowa) |
| ARI➣Acute Respiratory Illness |
| ARI➣Alcohol Related Injury |
| ARI➣Arden Realty, Inc. |
| ARI➣Arthur Rylah Institute (ecological research institute; Victoria, Australia) |
| ARI➣Aaron Rents, Inc. (various locations) |
| ARI➣Advisory Research, Inc. (various locations) |
| ARI➣Artist Run Initiative (various locations) |
| ARI➣Automotive Resources International |
| ARI➣Agricultural Research Institute |
| ARI➣Action Research International (online journal) |
| ARI➣Alarm Relay Interface |
| ARI➣Address Recognized Indicator |
| ARI➣Aspect Ratio Information |
| ARI➣Absolute Risk Increase |
| ARI➣Australian Rivers Institute (Griffith University; Australia) |
| ARI➣Aderans Research Institute (hair regeneration; Georgia) |
| ARI➣Acquisition Reform Initiative (US DoD) |
| ARI➣Appareil Respiratoire Isolant (French: Breathing Apparatus) |
| ARI➣African Rehabilitation Institute |
| ARI➣Average Recurrence Interval |
| ARI➣Arthritis and Rheumatism International |
| ARI➣Autoridad de la Región Interoceánica (Inter-Oceanic Authority) |
| ARI➣Adrenergic Reuptake Inhibitor (psychopharmacology) |
| ARI➣Advanced Research Institute |
| ARI➣Adsorption Research, Inc. (Dublin, OH) |
| ARI➣Andean Regional Initiative |
| ARI➣Access to Radiology Information (Integrating the Healthcare Enterprise) |
| ARI➣Aldose Reductase Inhibitor |
| ARI➣Afirmación para una República Igualitaria (Spanish; Argentina) |
| ARI➣Achaemenid Royal Inscriptions (archaeology) |
| ARI➣Allotments Regeneration Initiative (UK) |
| ARI➣Agence Régionale de l'Innovation (French: Regional Innovation Agency) |
| ARI➣Annual Risk of Infection |
| ARI➣Archaeological Research Institute |
| ARI➣Adelaide Research & Innovation Pty Ltd. (Australia) |
| ARI➣Azimuthal Resistivity Image (energy production) |
| ARI➣Alcohol Related Incident |
| ARI➣Autofahrer-Rundfunk-Information |
| ARI➣Airpower Research Institute |
| ARI➣Auto Recyclers, Inc. (various locations) |
| ARI➣Association Régionale pour l'Intégration (French: Association for Regional Integration; Marseille, France) |
| ARI➣Alexandria Research Institute (Alexandria, Virginia; Virginia Tech) |
| ARI➣American Refrigerant Institute (now Air Conditioning, Heating and Refrigeration Institute) |
| ARI➣Accelerated Research Initiative |
| ARI➣Acute Renal Insufficiency |
| ARI➣Applied Research Inc. |
| ARI➣All Risk Insurance |
| ARI➣ANSTO Radiopharmaceuticals and Industrials (Australia) |
| ARI➣Acute Respiratory Insufficiency |
| ARI➣Arica, Chile - Chacalluta (Airport Code) |
| ARI➣annual recurrence interval (hydrology) |
| ARI➣Aileron Rudder Interconnect |
| ARI➣Astoria Mini Mart (Amtrak station code; Astoria, OR) |
| ARI➣American Remanufacturers, Inc. |
| ARI➣Acoustics Research Institute |
| ARI➣Automatic Return Item |
| ARI➣Aviation Restructure Initiative |
| ARI➣Alternate Rod Insertion |
| ARI➣Associazione Rebussistica Italiana (Italian Rebus Association) |
| ARI➣Accounting Rate of Interest |
| ARI➣Automatic Room Identification |
| ARI➣Audience Research Institute |
| ARI➣Assistant de Recherche d'Informations sur Internet (French: Research Assistant of Information on the Internet; research software) |
| ARI➣Automatic Reset Induction (US Army) |
| ARI➣Agrarian Reform Institute |
| ARI➣Address Recognized Indicator Bit |
| ARI➣Aquifer Risk Index |
| ARI➣Agatston Research Institute (Miami Beach, FL, USA) |
| ARI➣Asia Rural Institute (Japan) |
| ARI➣Aileron to Rudder Interconnect |
| ARI➣Activity Routing Identifier |
| ARI➣Associazione Radiamatori Italiani (Italian Ham Radio Association) |
| ARI➣Affordable Readiness Initiative |
| ARI➣Attitude Reference Indicator |
| ARI➣ATS R&D IPT |
| ARI➣Abbey Road Interactive Studios (London, England) |
| ARI➣Automatic Rudder Interconnect |
| ARI➣Atelier de Ressources Informatiques (French: Computer Resources Workshop; est. 2003) |
| ARI➣Addressee Routing Indicator |
| ARI➣Armrest Rotary Input |
| ARI➣Actuarial Removal Interval |
| ARI➣Advanced Rigid Insulation |
| ARI➣Automatic Railway Information |