| Acronym | Definition |
|---|
| TI | Texas Instruments |
| TI | Training Instructor |
| TI | Title |
| Ti | Titanium |
| TI | Tajikistan |
| TI | Ticino (Swiss canton) |
| TI | Technical Information |
| TI | Transparency International |
| TI | Treasure Island (Hotel Casino Resort, Las Vegas, NV) |
| TI | Turn In |
| TI | Tessin (Ticino; Swiss Canton) |
| Ti | Tiistai (Finnish: Tuesday) |
| TI | Texas International (airline) |
| TI | Time Interval |
| TI | Toastmasters International |
| TI | Taxable Income |
| TI | Technical Institute |
| TI | Total Income |
| TI | Technology Integration (making systems that are not normally interoperable work with each other) |
| TI | Terminally Ill |
| TI | Traffic Information |
| TI | Temptation Island (TV show) |
| TI | Tenant Improvements |
| TI | Thoreau Institute |
| TI | Trypsin Inhibitor |
| TI | Thursday Island (Queensland, Australia) |
| TI | Turismo Internazionale (Alfa Romeo) |
| TI | Test Instrumentation |
| TI | Tribune Interactive |
| TI | Textile Institute |
| TI | Technical Inspection |
| TI | Tilt Steering (automotive) |
| TI | Technical Instruction |
| TI | Traducción e Interpretación (Spanish: Translation & Interpreting) |
| TI | Thermal Inertia |
| TI | Technology Insertion |
| TI | Technology Intelligence |
| TI | Therapeutic Index |
| TI | Technical Intelligence |
| TI | Transport Index |
| TI | Trunk Interface |
| TI | Temperature Indicator (industrial control description) |
| TI | Test Interface |
| TI | Test Instructions |
| TI | Total Insanity |
| TI | Inspiratory Time (medicine) |
| TI | Temperature Index |
| TI | Thymus Independent (Antigen; immunology) |
| TI | Tube Investments (Chennai, India) |
| TI | Triple Integral |
| TI | Technical Investigation |
| TI | Transmission Identification |
| TI | Tactical Intelligence |
| TI | Tactical Internet |
| TI | Technical Interface |
| TI | Thermal Imagery |
| TI | Targeted Individual |
| TI | Transactional Interpretation |
| TI | Target Indication |
| TI | Transfer Impedance |
| TI | Technical Impracticability (Superfund and RCRA waivers) |
| Ti | Tool Install |
| TI | Trace Index (linguistics) |
| TI | Teaching of Islam |
| TI | Transistorized Ignition |
| TI | Trace Identifier |
| TI | Temporary Intermittent |
| TI | Time Inserted |
| TI | Thought Insertion |
| TI | Tricuspid Incompetence |
| TI | Techneglas, Inc. |
| TI | Turbocharger-Intercooler (Volvo trim) |
| TI | Test Intensity |
| TI | Technical Insertion |
| TI | Teledyne Isotopes |
| TI | Tourismo Internationale (Alfa Romeo) |
| TI | Track Initialization |
| TI | Technician's Interface (Bay Networks) |
| TI | Toonami Infolink (website) |
| TI | Telecommunications Instruction |
| TI | Transition Initialization |
| TI | Throat Inlet |
| TI | Transmission Identification/Identifier |
| TI | Technology Insights, Inc. |