| Acronym | Definition |
|---|
| TSI➣Training Solutions, Inc. (est. 1995) |
| TSI➣Technical Services, Inc. (various locations) |
| TSI➣Trading Standards Institute (UK) |
| TSI➣Total Skill Index |
| TSI➣Transportation Services, Inc. (est. 1979) |
| TSI➣Touch Screen Interface (product feature) |
| TSI➣Total Solar Irradiance (sum solar light in energy per unit of time) |
| TSI➣Tibco Software, Inc. |
| TSI➣Türkiye Saati Ile (Turkish: By Turkey Time; time zone) |
| TSI➣True Sale International (Germany) |
| TSI➣Termination System Information |
| TSI➣Two Symbol Interval |
| TSI➣Turbo Supercharged Injection |
| TSI➣Transport Service Interpreter |
| TSI➣Trigger Supervisor Interface |
| TSI➣Time Slot Interchange |
| TSI➣Twincharger Stratified Injection |
| TSI➣Transmission Station Identification |
| TSI➣Transport Session Identifier |
| TSI➣Transmitting Subscriber Information |
| TSI➣Thailand Securities Institute |
| TSI➣Total Sky Imager (weather instrument) |
| TSI➣Turkish Statistical Institute |
| TSI➣The Sharper Image (various organizations) |
| TSI➣Thyroid Stimulating Immunoglobulin |
| TSI➣Triple Sugar Iron |
| TSI➣Town Sports International (New York) |
| TSI➣Third Sector Interface (Scotland; UK) |
| TSI➣Transportation Safety Institute (US DOT) |
| TSI➣True Solutions, Inc. (Dallas, TX; est. 1999) |
| TSI➣Timber Stand Improvement (forestry) |
| TSI➣TekSavvy Solutions, Inc. (Canada) |
| TSI➣Top Surface Imaging |
| TSI➣Thermal System Insulation (industry & regulatory term used with regard to asbestos) |
| TSI➣Teaching Science as Inquiry |
| TSI➣Top Secret Information |
| TSI➣Transforming Solutions, Inc. (Illinois) |
| TSI➣Techno-Sciences, Inc. (Beltsville, MD) |
| TSI➣Technical Specifications for Interoperability (railway standards) |
| TSI➣Transformed Social Interaction (research paradigm) |
| TSI➣Teaching Strategies, Inc. |
| TSI➣Tissue Synchronization Imaging (parametric imaging tool) |
| TSI➣Therapeutic Systems, Inc. (Sarasota, FL) |
| TSI➣Therapeutic Services, Inc.(Brooklyn, NY) |
| TSI➣Technique et Science Informatique (French: Computer Science and Technology; journal) |
| TSI➣Transportation Security Incident |
| TSI➣The Sulphur Institute (Washington, DC; est. 1960) |
| TSI➣Traumatic Stress Institute |
| TSI➣Turbine Supervisory Instrumentation |
| TSI➣Treehouse Software Inc. |
| TSI➣Telecommunications Service Inquiry (Australia) |
| TSI➣Thermal Systems Inc (Scarborough, Maine) |
| TSI➣Transportation Security Inspector (US DHS) |
| TSI➣Transworld Systems Incorporated (various locations) |
| TSI➣Trophic Status Index (water quality) |
| TSI➣Transmitting Subscriber Identification |
| TSI➣Technical Service Information |
| TSI➣Trauma Severity Index |
| TSI➣Treasury Strategies, Inc. (various locations) |
| TSI➣Tony Stone Images (photography company) |
| TSI➣Total Sum Insured |
| TSI➣Tech Services International |
| TSI➣Transportation Systems Institute |
| TSI➣The Skeptical Inquirer |
| TSI➣Turbo Stratified Injection |
| TSI➣Teach Services Inc. (book publisher) |
| TSI➣Tokyo Servicer, Inc. (Japan) |
| TSI➣Twin Stage Impinger |
| TSI➣Talent Scouts Inc. |
| TSI➣Total Systems Integration, Inc (Galion, Ohio) |
| TSI➣True Sales Initiative |
| TSI➣Technical Studies Institute (various locations) |
| TSI➣Technical Sales International, LLC (Austin, TX ) |
| TSI➣Thinking Style Inventory |
| TSI➣Training Systems Integration (US Army) |
| TSI➣Transportation System Improvement |
| TSI➣Technical Standardization Inspection |
| TSI➣Territory Sales Incharge |
| TSI➣Time-Space Illusion |
| TSI➣Technical Site Information |
| TSI➣Turbo Sport Injection (automotive) |
| TSI➣Turksportal Interactive |
| TSI➣Tactical Situation Indicator |
| TSI➣Temporal Sharing Interface |
| TSI➣Transport Subsystem Interface |
| TSI➣Transmitting Station Information (Fax) |
| TSI➣TEMPEST Security Index |
| TSI➣Time Slot Interchange/r |
| TSI➣Typography Systems International |
| TSI➣Threshold Signal-to-Interference Ratio |
| TSI➣Training Support Infrastructure (US Army TRADOC/ATSC/ATMD) |
| TSI➣Terminal Support Interface |
| TSI➣Test Ship Integration |
| TSI➣Training Standards Institute |
| TSI➣Top Systems Inc. |
| TSI➣Target Status Indicator |
| TSI➣TRADOC Simulation Internet |
| TSI➣Terminal Signaling Interface |
| TSI➣Touring Sport Injection |
| TSI➣That's Scrap Inc (Apple Valley, MN) |