| Abbreviation | Definition |
|---|---|
| ALTER | altering |
| ALTERNATE | Alternative |
| ALTERTEC | Altertech |
| ALTH | at A Little Touch of Heaven |
| ALTI | Art Live Theatre International |
| ALTI | Atlanti Linguistici Tematici Informatici |
| ALTL | A Love To Last |
| ALTL | Allen linear temporal logic |
| ALTL | Ased Linear Temporal Logic |
| ALTM | Airborne Laser Terrain Mappers |
| ALTM | Airborne Laser Terrain Mapping |
| ALTO | A Little Teachable Object |
| ALTO | Analyzed Layout and Text Object |
| ALTO | Application Layer Traffic Optimization |
| ALTO | Application Level Traffic Optimization |
| ALTO | Association of Language Travel Organizations |
| ALTO | Austin Lazer Tag Organization |
| ALTOTA | Alto >> Ta |
| ALTOTA | alto/ ta |
| ALTP | A Link to the Past |