| Abbreviation | Definition |
|---|---|
| AQ | Attendance Quiz |
| AQ | Accumulator-quotient Register |
| AQ DIST | Distilled Water |
| AQA | All Qualified Applicants |
| AQA | Any Question Answered |
| AQAFO | Aeronautical Quality Assurance Field Office |
| AQAP | Air Quality Action Plan |
| AQC | Administrative Quality Control |
| AQC | American Quality Congress |
| AQC | Automatic Quick Call |
| AQI | Air Quality Index |
| AQIS | Australian Quarantine and Inspection Service |
| AQL | Acceptable Quality Level |
| AQMD | Air Quality Management District |
| AQP | Advanced Qualification Program |
| AQR | Automotive Quick Reference |
| AQS | Air Quality Subsystem |
| AQS | Advanced Quality Settings |
| AQSG | Air Quality Steering Group |
| AQSIQ | Administration of Quality Supervision Inspection and Quarantine |
| AQT | Acceptance Quality Testing |
| AQUA | Amino Qnx Unified Architecture |
| AR | Analytical Reagent |
| AR | Aspect Ratio |
| AR | Audio Rate |
| AR | Address Register |
| AR | Add Rows |
| AR | Active Resistance |
| AR | Apical Rate |
| AR | Artificial Respiration |
| AR | Assisted Respiration |
| AR | Anti Reflux |
| AR | Acid Reflux |
| AR | Anal Retentive |
| AR | Accounts Receivable |
| AR | Agricultural Residues |
| AR | Atmosphere Revitalization |
| AR | Aylestone Road |
| AR | Accelerated Reading |
| AR | Alternative Response |
| AR | Auto Regressive |
| AR | Account Review |
| AR | Annual Return |
| AR 55-80 | Highways for National Defense |
| ARA | Aerosol Liquid with Adapter |
| ARA | Action Research Arm |
| ARA | Angiotensin Receptor Antagonist |
| ARA | Anthracycline Resistance Associated |
| ARA | Accredited Rural Appraiser |
| ARA | Automotive Rebuilders Association |