| AB | Bachelor of Arts |
| ABA | American Bar Association |
| ac | acre(s) |
| Acad | Academy |
| ADC | Aide-de-Camp |
| Adj | Adjutant |
| Admin | Administration |
| Adml | Admiral |
| Advsr | Advisor |
| AEF | American Expeditionary Force |
| Affrs | Affairs |
| Ag | Agriculture/agricultural |
| Agy | Agency |
| AICE | American Institute of Consulting Engineers |
| AM | Master of Arts |
| Amb | Ambassador |
| apptd | appointed |
| Apt | Apartment |
| Arty | Artillery |
| Assist | Assistant |
| Assoc | Associate/Association |
| Atty | Attorney |