| Abbreviation | Definition |
|---|---|
| ACTIVITY | Activities |
| ACTJ | Antenna Coupled Tunnel Junction |
| ACTL | Access Customer Terminal Location |
| ACTL | Alberta Carbon Trunk Line |
| ACTM | A Call To Men |
| ACTM | Aufdenkamp Connection Transmission Main |
| ACTN | Abstraction and Control of TE Networks |
| ACTN | Abstraction and Control of Transport Networks |
| ACTN | American Commercial Tire Network |
| ACTO | Advocacy Centre for Tenants Ontario |
| ACTO | Amazon Cooperation Treaty Organisation |
| ACTO | Amazon Cooperation Treaty Organization |
| ACTOR | Action Collaboration Tone Oration and Rhythm |
| ACTP | Abrasion Cut Tear and Puncture |
| ACTP | Abrasion Cut Tear Puncture |
| ACTP | Accredited Coach Training Program |
| ACTP | Accredited Coach Training Programme |
| ACTP | Accredited Coaching Training Program |
| ACTP | Allocation Compensatrice De Tierce Personne |
| ACTP | Approved Coach Training Program |