| Abbreviation | Definition |
|---|---|
| ACORN | Acadia Courseware Online Resource Network |
| ACORN | Alien Counter Offense Response Network |
| ACORN | Anguilla Commercial Online Registration Network |
| ACORN | Artisans and Crafters of Rural North |
| ACORN | Association of Community Organizers for Reform Now |
| ACOS | Advanced Core Operating System |
| ACOS | Associate Chief Of Staff |
| ACOSA | Acosador |
| ACOT | A Cherry on Top |
| ACOT | Advanced Communications Officer Training |
| ACOT | Advisory Committee on Organ Transplantation |
| ACOT | American College of Technology |
| ACOT | Analog Channel Operational Test |
| ACOT | Ancient Context of the Old Testament |
| ACOT | Apple Classroom of Tomorrow |
| ACOT | Apple Classrooms of Tomorrow |
| ACOT | Art Center on Tusc |
| ACOT | Atlantic Coast Old Timers |
| ACOTAN | A Cup Of Tea At Night |
| ACOU | Additional Call Offering Unconditional |