| Acronym | Definition |
|---|
| TTIS➣Total Time in Service |
| TTIS➣Travel and Transport Information Service |
| TTIS➣The Telegraph in Schools (Indian student newspaper) |
| TTIS➣Take Two Interactive Software, Inc. |
| TTIS➣Teens Teaching Internet Skills (4-H) |
| TTIS➣Transformed Tile Iteration Space |