| Acronym | Definition |
|---|
| TIR➣Total Internal Reflection |
| TIR➣Thermal Infrared (ASPRS) |
| TIR➣Total Immersion Racing (game) |
| TIR➣Tasa Interna de Retorno (Spanish: Internal rate of return) |
| TIR➣Thermal Infra Red |
| TIR➣Toll-Interleukin 1 Receptor |
| TIR➣Traumatic Incident Reduction |
| TIR➣Technical Information Release (IRS) |
| TIR➣Total Indicator Reading |
| TIR➣Technical Information Report |
| TIR➣Termite Inspection Report |
| TIR➣Total Indicated Runout |
| TIR➣Titre d'Identité Républicain (French: Republican Identity Title) |
| TIR➣Total Indicator Runout |
| TIR➣Terminal Inverted Repeat |
| TIR➣Test Incident Report |
| TIR➣Translation Initiation Region |
| TIR➣Transit International Routier |
| TIR➣Total Item Record |
| TIR➣Transport International de Marchandises par Route (French: international cariage of goods by rail) |
| TIR➣Transport International par la Route (French) |
| TIR➣Time in Rate (pay grade) |
| TIR➣Total Internal Refraction |
| TIR➣Texas Independence Relay |
| TIR➣Tender Information Request (Australia) |
| TIR➣Theories of International Relations (university course) |
| TIR➣Target Illuminating Radar |
| TIR➣Terminal Imaging Radar |
| TIR➣Transport International de Marchandises par la Route |
| TIR➣The Internet Ramp (Michigan ISP) |
| TIR➣Target Indication Room (US Navy) |
| TIR➣Transport Internationaux Routiers |
| TIR➣Type Inspection Report |
| TIR➣Target Impulse Response |
| TIR➣Trailer Interchange Receipt |
| TIR➣True Image Recovery (Veritas Netbackup) |
| TIR➣The Inspiration Room (website) |
| TIR➣Test Inspection Report |
| TIR➣Technology Insertion Recapitalization |
| TIR➣Tactical Intelligence, Reconnaissance |
| TIR➣Technical Interface Requirement |
| TIR➣Technical Interoperability Requirement |
| TIR➣Technical Interface Recertification |
| TIR➣Team Impulse Racing |
| TIR➣Total Incidents Recorded (safety statistics) |
| TIR➣Target Individual Risk |
| TIR➣Trainee Integrated Ratings |
| TIR➣Tie in Requirements |
| TIR➣Technical Infrastructure Requirements |
| TIR➣Test-In Reliability |
| TIR➣Trouble Incident Report |
| TIR➣Transaction Item Record/Report |
| TIR➣Trip Indication Relay (circuitry) |
| TIR➣Terrorist Incident Report (US Army) |