| Acronym | Definition |
|---|
| APTI➣Air Pollution Training Institute |
| APTI➣ARCO (Atlantic Richfield Oil Company) Power Technologies, Inc. |
| APTI➣Association for Preservation Technology International |
| APTI➣Association for Psychological Type International |
| APTI➣American Post Tension, Inc. (formerly Magic Communications, Inc.; pay phones) |
| APTI➣Advanced Power Technology, Inc. (Setauket, NY) |
| APTI➣Association of Pharmaceutical Teachers of India (est. 1966; Bangalore, India) |