| Acronym | Definition |
|---|
| TRA | Training |
| TRA | Transfer |
| TRA | Transition |
| TRA | Tennessee Regulatory Authority |
| TRA | Telecommunications Regulatory Authority |
| TRA | Tire and Rim Association |
| TRA | Tax Reform Act (1976, 1984, or 1986) |
| TRA | Taxpayer Relief Act of 1997 |
| TRA | Taiwan Relations Act (US domestic law) |
| TRA | Theory of Reasoned Action |
| TRA | Trade Readjustment Allowance |
| TRA | Teachers Retirement Association |
| TRA | Tanzania Revenue Authority |
| TRA | Taiwan Railway Administration |
| TRA | Test Reactor Area |
| TRA | Texas Restaurant Association (Austin, TX) |
| TRA | Tripoli Rocketry Association |
| TRA | Threat and Risk Assessment |
| TRA | Telecommunications Resellers Association |
| TRA | Trinity River Authority |
| TRA | Tumor Rejection Antigen |
| TRA | Technology Readiness Assessment |
| TRA | Theodore Roosevelt Association |
| TRA | Telecommunications Research Associates |
| TRA | The Rebel Alliance (gaming clan) |
| TRA | Temporary Reserved Airspace |
| TRA | Traffic Routing Administration |
| TRA | Temporary Restricted Area |
| TRA | Time-Reversal Acoustics |
| TRA | Task Risk Assessment |
| TRA | The Reciprocal Alliance |
| TRA | Throttle Resolver Angle |
| TRA | Trachoma Rapid Assessment |
| TRA | Torhoutse Radio Amateurs (Oostkamp, Belgium) |
| TRA | Thrust Reduction Altitude (aviation) |
| TRA | Training Requirements Analysis |
| TRA | Telecommunications Reform Act of 1996 |
| TRA | Technical Reference Architecture |
| TRA | Transceiver Assembly (wireless) |
| TRA | Towers Residence Association (Iowa State University dorm association) |
| TRA | Tapered Rod Antenna |
| TRA | Tactical Response Academy (Salem, OR) |
| TRA | Tiruvannamalai Ramana Ashram (India) |
| TRA | Thin Rod Approximation |
| TRA | Technical Requirement Analysis |
| TRA | Total Rate of Return Analytic |
| TRA | Time Reporting Assistance (Sprint) |
| TRA | Trouble Report Automation (Sprint PCS) |
| TRA | Transverse Ray Aberration |