| Abbreviation | Definition |
|---|---|
| A | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA |
| AADC | Automated Area Distribution Center |
| AB | AlBerta |
| ABBREVIATIONFORROAD | what is abbreviation for the letter "R" |
| ABE | Automated Barcode Evaluator |
| ABMPS | Automated Business Mail Processing System |
| AC | Actual Count |
| ACDCS | Air Contract Data Collection System |
| ACS | Address Change Service |
| ACT | Air Contract Transportation tag |
| AD | Andorra |
| ADA | Advance Deposit Account |
| ADAPT | Automatic Density Analysis Profile Technique |
| ADC | Area Distribution Center |
| ADDR | ADDRess |
| AE | Additional Entry |
| AE | United Arab Emirates |
| AF | Afghanistan |
| AFC | Advanced Facer-Canceler |
| AFCS/OCR | Advanced Facer Canceler System with Optical Character Reader |