| Acronym | Definition |
|---|
| TCSI➣Tire Customer Satisfaction Index |
| TCSI➣Transaction Code Status Indicator (telecommunications billing) |
| TCSI➣The Cool Science Institute (educational robotics) |
| TCSI➣Transaction Code Status Indicator (telecommunications) |
| TCSI➣Tri-City Software, Inc. |
| TCSI➣Touch Community Services International (est. 1999; Singapore) |
| TCSI➣Transmitter Channel State Information |