| Abbreviation | Definition |
|---|---|
| ACTF | Amorphous Carbon Thin Film |
| ACTF | Auto Crimes Task Force |
| ACTG | A Chance To Grow |
| ACTG | America China Turkey Germany |
| ACTI | Abstract and Concrete Templates and Instances |
| ACTID | Athens County Transportation Improvement District |
| ACTIF | Action Cinema Talents and Ideas Factory |
| ACTION | Activating Citizens to Impact Our Nation |
| ACTION | Adopting Changes to Improve Outcomes Now |
| ACTION | American Council To Improve Our Neighborhoods |
| ACTION | Australian Capital Territory Internal Omnibus Network |
| ACTIS | Aranui Community Trust Incorporated Society |
| ACTIT | Activities |
| ACTIT | Activity |
| ACTIVATE | Activated |
| ACTIVATE | Activating |
| ACTIVATE | Activation |
| ACTIVATED | Activating |
| ACTIVATED | Activation |
| ACTIVISM | Activists |