| Acronym | Definition |
|---|
| AR➣Argentina |
| AR➣Arkansas (US postal abbreviation) |
| AR➣Assault Rifle |
| AR➣Argon |
| AR➣Accounts Receivable |
| AR➣Arabic |
| AR➣Administrative Record |
| AR➣Army Regulation |
| AR➣Amateur Radio |
| AR➣Annual Report |
| AR➣Accelerated Reader |
| AR➣Adventure Racing |
| AR➣Animal Rights |
| AR➣Army Reserve |
| AR➣As Required |
| AR➣Annual Reviews |
| AR➣Action Required |
| AR➣American Revolution |
| AR➣Action Replay (game console cheat device) |
| AR➣Active Region (sunspot observation) |
| AR➣American Racing (American Racing wheels) |
| AR➣Action Research |
| AR➣Air Rifle |
| AR➣Annual Rate |
| AR➣Access Router |
| AR➣Amazing Race (reality TV show) |
| AR➣Acrobat Reader (Adobe Systems) |
| AR➣Armor |
| AR➣Anti-Reflection |
| AR➣Automatic Rifle |
| AR➣Acid Reflux |
| AR➣Abuse Report (gaming, Second Life) |
| AR➣Augmented Reality |
| AR➣Anti-Reflective |
| AR➣Aspect Ratio |
| AR➣Acoustic Research (loudspeaker manufacturer) |
| AR➣Authorized Representative |
| AR➣Annual Return |
| AR➣After Rebate |
| AR➣Abbey Road (Beatles album/song) |
| AR➣Aromatic |
| AR➣Androgen Receptor |
| AR➣Argent (Heraldic White or Silver) |
| AR➣Action Report |
| AR➣Arizona Republic (newspaper) |
| AR➣Activity Reports |
| AR➣Antibiotic Resistance |
| AR➣Account Representative (Sprint) |
| AR➣Adrenergic Receptor (protein) |
| AR➣Repair Ship |
| AR➣Aishwarya Rai (Indian actress) |
| AR➣Abnormal Returns |
| AR➣Ayn Rand (novelist and philosopher) |
| AR➣Authorized Reseller |
| AR➣Armalite (rifle company) |
| AR➣All Risks |
| AR➣Aerolíneas Argentinas |
| AR➣Association Rules |
| AR➣Atlantic Records (record label) |
| AR➣Administrative Regulation (various organizations) |
| AR➣Address Register |
| AR➣Autoregressive |
| AR➣Alternate Routing |
| AR➣Appenzell Außerrhoden (Swiss Half Canton) |
| AR➣ArmaLite Rifle (engineering company; Genesco, IL) |
| AR➣Assistant Referee (sports) |
| AR➣Allergic Rhinitis |
| AR➣Akademia Rolnicza (Polish: University of Agriculture) |
| AR➣As Removed (avionics) |
| AR➣Automated Reasoning |
| AR➣Alan Rickman (British actor) |
| AR➣Autosomal Recessive (genetics; recessive gene on one of the 23 pairs of autosomes) |
| AR➣Alternative Radio (public affairs program) |
| AR➣Assembleia da República (Portuguese parliament) |
| AR➣Arrêté Royal (French: Royal Decree; Belgium) |
| AR➣Adverse Reaction |
| AR➣Accusé de Réception (French: Acknowledgment of Receipt; mail) |
| AR➣Artificial Respiration (aka artificial resuscitation) |
| AR➣Analyst Relations (various locations) |
| AR➣Antimicrobial Resistance |
| AR➣Atmospheric Research |
| AR➣Ancien Regime (gaming) |
| AR➣Adrenaline Rush (gaming; also an IMAX film) |
| AR➣Arsenide |
| AR➣Acknowledge Receipt |
| AR➣Air Route |
| AR➣Area Record (sports) |
| AR➣Air Refueling |
| AR➣Army Ranger |
| AR➣Aortic Regurgitation (aortic insufficiency) |
| AR➣Anal Retentive |
| AR➣Air Resistance |
| AR➣Area Ratio |
| AR➣Arista Records (record label) |
| AR➣Attributable Risk |
| AR➣Appenzell Ausser-Rhoden (postcode, Switzerland) |
| AR➣Aldose Reductase |
| AR➣Acute Rejection |
| AR➣Aerial Refueling |
| AR➣American Robin |
| AR➣Angle Resolved |
| AR➣All Rail |
| AR➣Attrition Rate |
| AR➣Access Right |
| AR➣Abandon Rate |
| AR➣Arm's Reach |
| AR➣Arezzo, Toscana (Italian province) |
| AR➣Authorization Request |
| AR➣Anti-Radiation |
| AR➣Aqua Regia |
| AR➣Aerial Reconnaissance |
| AR➣Agency Resources |
| AR➣Arrest Report (law enforcement) |
| AR➣Attack Rating (Diablo II) |
| AR➣Acquisition Reform |
| AR➣Autonomous Republic |
| AR➣Access Rate |
| AR➣Assistant Registrar |
| AR➣Automatic Response |
| AR➣Area Representative |
| AR➣Avis de Réception (Canada Post) |
| AR➣Age Regression |
| AR➣African Rights |
| AR➣Anti-Radar |
| AR➣Atrophic Rhinitis (pig respiratory disease) |
| AR➣Axial Ratio |
| AR➣Ancestral Roots (genealogy) |
| AR➣Approval Request |
| AR➣Air Reconnaissance |
| AR➣Active Radar |
| AR➣Activity Ratio |
| AR➣Approximate Reasoning |
| AR➣Attack Release |
| AR➣Anton Rubinstein (classical pianist) |
| AR➣Auto Redial |
| AR➣Analytical Reagent |
| AR➣Airborne Reconnaissance |
| AR➣Aftermath Records (record label) |
| AR➣Agent Report |
| AR➣Add Register |
| AR➣Abstellraum (German: storage room) |
| AR➣Acceptance Review |
| AR➣Asistencia Respiratoria |
| AR➣Acquisition Risk |
| AR➣Art Remains (online art gallery) |
| AR➣Affiliate Relations |
| AR➣Accounts Register |
| AR➣Acquiescence Ruling |
| AR➣Application Record |
| AR➣Automation Resources |
| AR➣Automatic Recall (Bellcore) |
| AR➣Acetal Resin |
| AR➣Arrezo (postcode, Italy) |
| AR➣Advanced Reactor |
| AR➣Acoustic Reflex |
| AR➣Associate Referee (various organizations) |
| AR➣Alarm Reaction |
| AR➣Administrative Requirement |
| AR➣Assessment Request |
| AR➣American Rifleman Magazine |
| AR➣Armor Rating (gaming, Asheron's Call 2) |
| AR➣Auxiliary Relay |
| AR➣Acquisition Request |
| AR➣Alabama Railroad |
| AR➣Alarm Report |
| AR➣Approved Rejected |
| AR➣Air Revitalization |
| AR➣Asset Reconciliation |
| AR➣Anomaly Report |
| AR➣Application Requester |
| AR➣Artificial Resuscitation |
| AR➣Auburn Reporter (community newspaper) |
| AR➣Anti-Reflectance |
| AR➣Arise Records |
| AR➣Airworthiness Representative |
| AR➣Airborne Relay |
| AR➣Activity Resume (ITU-T) |
| AR➣American Rivers, Inc. |
| AR➣Advice of Receipt (Canada Post) |
| AR➣Absorber Rod |
| AR➣Acoustique Renforcée (French: Enhanced Acoustics; window noise insulation) |
| AR➣Auxiliary Room |
| AR➣Archival Researcher |
| AR➣Affirmative Rebuttal (debate) |
| AR➣Postal Fiscal (Scott Catalogue prefix; philately) |
| AR➣Attrition Reserve (aircraft) |
| AR➣Atmospheric Revitalization |
| AR➣Automatic Resupply |
| AR➣Auxiliary Receiver |
| AR➣Avance-Retard (French) |
| AR➣Auscultacion Respiratoria (Spanish: Respiratory Auscultation) |
| AR➣Arrow Revolver (game, Mabinogi) |
| AR➣Allied Racing (Halo racing clan) |
| AR➣Attributive Risk |
| AR➣ASR Status |
| AR➣Armor Rendering (gaming, Asheron's Call) |
| AR➣Argonne Area Office (US DOE) |
| AR➣Altesse Royal (French: Royal Highness) |
| AR➣Aeronautical Requirement |
| AR➣Adaptive Reception Control |
| AR➣Architecture and Requirements Office (NIMA) |
| AR➣Automation Recall |
| AR➣Amusement Radio (online radio station) |
| AR➣Agonist Reversal (PNF technique) |
| AR➣Anno Resurrectionis (Year of the Resurrection, epigraphy) |
| AR➣End of message / Out (logging abbreviation) |
| AR➣Allotment Reconciliation |
| AR➣Agent Requisitions |
Ar - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
AR - a state in south central United States; one of the Confederate states during the American Civil War