| Abbreviation | Definition |
|---|---|
| ACHOO | American Central Health Organization Olfactory |
| ACHOO | Augustana Community Health Outreach Organization |
| ACHR | Albuquerque Center for Hope Recovery |
| ACHR | American Convention on Human Rights |
| ACHR | Arab Charter on Human Rights |
| ACHS | Abraham Clark High School |
| ACHS | Adams City High School |
| ACHS | Adolfo Camarillo High School |
| ACHS | American Canyon High School |
| ACHS | Anderson County High School |
| ACHS | Andover Central High |
| ACHS | Andover Central High School |
| ACHS | Ankeny Centennial High School |
| ACHS | Arizona Collegiate High School |
| ACHS | Arlington Catholic High School |
| ACHS | Arlington Collegiate High School |
| ACHS | Ashe County High School |
| ACHS | Atlantic City High School |
| ACHS | Atlantic Coast High School |
| ACHT | Average Call Hold Time |