| Acronym | Definition |
|---|
| T | True |
| T | Telephone |
| T | Trainer (US military aircraft designation; as in T-1 Seastar) |
| T | Time |
| T | Teen (ESRB) |
| T | Team |
| T | Technology |
| T | Test |
| T | Training |
| T | Ten (playing card) |
| T | Term (life insurance) |
| T | Technical (foul) |
| T | Tip |
| T | Traffic |
| T | Target Corporation (IRB) |
| T | Massachusetts Bay Transportation Authority |
| T | Techno |
| T | Tea |
| T | Tie |
| T | Toyota |
| T | Temperature |
| T | Draft (naval architecture; waterline height) |
| T | AT&T (stock exchange symbol) |
| T | Tank (oil & water tanks) |
| T | Terminal |
| T | Transition Metal |
| T | Testosterone |
| T | Transformation (mathematics) |
| T | Alberta (postal code designation, Canada) |
| T | Tactics |
| T | Tackle (football) |
| T | Treasury (various organizations) |
| T | Terrorist |
| T | Transmit |
| T | Tango (aviation letter code) |
| T | Traded (baseball card set designation) |
| T | Torque |
| T | Thesis |
| T | Tera |
| T | Transpose |
| T | Tasmania |
| T | Trillion |
| T | Throughput |
| T | teaspoon |
| T | Tonne |
| T | tablespoon |
| T | Tesla |
| T | Thunderstorm (weather reports) |
| T | Topps (baseball card manufacturer) |
| T | Taxe (French: tax; postage due mark; philately) |
| T | Thymus |
| T | TORX (Textron Inc. driver/fastening system) |
| T | T-Mo (rapper) |
| T | Threonine (amino acid) |
| T | Transmittance |
| T | Turbocharge(d) |
| T | Thrust Force (aerodynamic equations) |
| T | Topicality (debate) |
| T | Thymine (DNA base) |
| T | Temporary Register |
| T | T-Joint (welded joint type) |
| T | Transmissivity |
| T | Thoracic Vertebra (prefix, as in T-1, T-2) |
| T | Tureaud (Mr. T) |
| T | US Telegraph (Scott Catalogue prefix; philately) |
| T | True Bearing |
| T | Thermostabilized (space food) |
| T | Tiefdruckgebiet (German: low pressure system) |
| T | Taxable Item |
| T | Tracer element (US military ammunition) |
| T | Primary immune system white blood cell |
| T | US DoT tire speed rating (118 mph) |
| T | With mark approval by Dentori or Japan Electrical Testing Laboratory (JET) |