| Acronym | Definition |
|---|
| TRI➣Trinidad (Amtrak station code; Trinidad, CO) |
| TRI➣Toxics Release Inventory (US EPA) |
| TRI➣Technology Research Institute (various locations) |
| TRI➣Tokai Rubber Industries (Japan) |
| TRI➣The Rutherford Institute (Charlottesville, VA) |
| TRI➣Tootsie Roll Industries |
| TRI➣Teaching Research Institute (various locations) |
| TRI➣Toronto Rehabilitation Institute (Toronto, Ontario, Canada) |
| TRI➣Taipei Ricci Institute (Taiwan) |
| TRI➣Touch Research Institute |
| TRI➣Transportation Research Institute |
| TRI➣Taux de Rendement Interne (French: Internal Rate of Return) |
| TRI➣Tile Roofing Institute |
| TRI➣Texas Research Institute (Austin, TX) |
| TRI➣Taux de Rentabilité Interne (French: internal rate of return) |
| TRI➣Taux de Rentabilité Interne |
| TRI➣Transition Research Institute |
| TRI➣Type Rating Instructor (aviation) |
| TRI➣Terminal Reality Inc. |
| TRI➣Tecolote Research, Inc (Goleta, CA government contractor) |
| TRI➣Target Resources, Inc. (California) |
| TRI➣Toxin Research International |
| TRI➣The Rensselaerville Institute |
| TRI➣Teleretinal Imaging |
| TRI➣Tax Reduction Institute (Germantown, MD) |
| TRI➣Time-Reversal Invariance |
| TRI➣Trikloretylen |
| TRI➣The Remanufacturing Institute |
| TRI➣Total Recordable Injuries |
| TRI➣Teacher Recruitment Initiative (various locations) |
| TRI➣The Rothberg Institute (children's medical group; Guilford, CT) |
| TRI➣Technology Readiness Index (Parasuraman) |
| TRI➣Training Requirements Integration |
| TRI➣Bristol/Johnson City/Kingsport, TN, USA - Municipal Tri-City Airport (Airport Code) |
| TRI➣Toronto Recycling, Inc. (Ontario, Canada) |
| TRI➣Turnaround Inspection (between flight aircraft safety inspection) |
| TRI➣Total Resource Inventory |
| TRI➣Thrust Rating Indicator (aviation) |
| TRI➣Thermal Response Index |
| TRI➣Time Reporting Information |
| TRI➣Targeted Readiness Inspection (US Air Force) |
| TRI➣Tuna Research Institute |
| TRI➣Time-Response-Initial |
| TRI➣Toxics Release Index (less common) |
| TRI➣Three Random Initial(s) |
| TRI➣Transit Route Identification |
| TRI➣Telecommunications Reporting Instruction |
| TRI➣Tower Radar Indicator |