| Abbreviation | Definition |
|---|---|
| TA | Terminal Adapter |
| TAAC | Telecommunications Access Advisory Committee |
| TAC | Terminal Access Circuit |
| TACS | Telephone Access Customer Satisfaction |
| TACS | Total Access Communications System |
| TAD | Telephone Answering Device |
| TADS | Terminating Access Domain Selection |
| TAE | Terminal Adapter Equipment |
| TAIT | Telecommunications and Applied Information Theory |
| TAM | Telephone Answering Machine |
| TAMS | Telecom Analysis and Management System |
| TANE | Telephone Association of New England |
| TAP | Telecommunity Appalachian Project |
| TAP | Telocator Alphanumeric Paging |
| TAP | Test Access Path |
| TAP | Transferred Account Procedure |
| TAPD | Telecommunications Access Policy Division |
| TAPS | Telephone Application Processing System |
| TASI | Time Assigned Speech Interpolation |
| TAST | Terrestrial Aeronautical and Spatial Telecommunications |