| Acronym | Definition |
|---|
| TEI | Text Encoding Initiative |
| TEI | Total Economic Impact |
| TEI | Teacher Education Institution |
| TEI | Tax Executives Institute, Inc. |
| TEI | Terminal Equipment Identifier |
| TEI | Terminal Endpoint Identifier |
| TEI | Terminal Endpoint Identifier (ISDN Layer 2) |
| TEI | Thailand Environment Institute |
| TEI | The Education Institute (Texas) |
| TEI | Technological Educational Institute (Greece) |
| TEI | Tertiary Education Institute (various locations) |
| TEI | Thermal Engineering International (US and UK) |
| TEI | The Education Initiative (various organizations) |
| TEI | Total Estimated Investment (various locations) |
| TEI | Trans-Earth Injection |
| TEI | Thermo Environmental Instruments |
| TEI | Tusas Engine Industries Inc (Turkey) |
| TEI | Tag Extra Info (java class type) |
| TEI | Thermal Energy International, Inc (Ottawa, Ontario, Canada) |
| TEI | Training and Exercise Integration (US FEMA) |
| TEI | Text Element Identifier (Unique Item Identification Program) |
| TEI | Truth Establishment Institute |
| TEI | Treasury Executive Institute |
| TEI | Temporary Equipment Identifier |
| TEI | Terminal Equipment Identification |
| TEI | Trans-Earth Insertion |
| TEI | Trompeter Electronics, Inc. |
| TEI | Triumvirate Environmental, Inc. (Astoria, NY) |
| TEI | Temporary Engineering Instruction |
| TEI | Thomson Electronics, Inc. |
| TEI | Test-End Instrumentation |
| TEI | Technologies Engineering Inc. |
| TEI | Throughput Expectation Index (Internet application) |