| Acronym | Definition |
|---|
| TAI | Taiwanese (language) |
| TAI | Think About It |
| TAI | TSA (Transportation Security Administration) Approved Instructor |
| TAI | Turkish Aerospace Industries |
| TAI | The Academy Is (band) |
| TAI | Tervise Arengu Instituudi (Estonian: National Institute for Health) |
| TAI | International Atomic Time |
| TAI | Team Assisted Individualization (mathematics program) |
| TAI | Trust Association Interceptor |
| TAI | Tracking Area Identity (wireless communications) |
| TAI | Target Area of Interest |
| TAI | The Academy Is.. (band) |
| TAI | Traffic Accident Investigation |
| TAI | The Access Initiative (civil society network) |
| TAI | The Arctic Incident (book) |
| TAI | Toshiba America, Inc. (New York, NY) |
| TAI | Thailand Automotive Institute |
| TAI | Technical Analysis Indicator |
| TAI | Tactical Air Interdiction |
| TAI | Toshiba America Inc. |
| TAI | Temps Atomique International (International Atomic Time) |
| TAI | Thermal Anti-Ice (aviation) |
| TAI | Therapeutic Associates, Inc. (various locations) |
| TAI | Traditional Arts Indiana |
| TAI | Technology Applications, Inc. (various locations) |
| TAI | Technology Achievement Index |
| TAI | Technical Associates, Inc. (Ventura, CA) |
| TAI | Travelers Aid International |
| TAI | The Asphalt Institute (trade association) |
| TAI | Total Aircraft Inventory |
| TAI | Threat Analysis Index |
| TAI | Tools for Artificial Intelligence (Conference) |
| TAI | The Aerospace Institute (El Segundo, CA) |
| TAI | Telefoniczna Agencja Informacyjna (Polish: Telephone Information Agency) |
| TAI | Thermal Alteration Index |
| TAI | Tusas Aerospace Industries, Inc (Turkey) |
| TAI | Transmit Additional Information |
| TAI | Tri-Service Assessment Initiative |
| TAI | Tuskegee Airmen, Incorporated |
| TAI | TACA International Airlines, El Salvador (ICAO code) |
| TAI | Taiz, Yemen - Al-Janad (Airport Code) |
| TAI | Total Active Inventory |
| TAI | Television Associates of Indiana (est. 1947) |
| TAI | Trade Associates, Inc. |
| TAI | Time, Atomic International |
| TAI | Tunable Active Inductor |
| TAI | TRADOC Acquisition Instruction |
| TAI | Thermal Acoustic Imaging |
| TAI | ThermoAnalytics, Incorporated (Calumet, Michigan) |
| TAI | Treasury Acquisitions Institute |
| TAI | Treaty Accountable Item |
| TAI | Topolino Autoclub Italia (Italian: Mickey Automobile Italy; car club; est. 1976) |