| Subject | English | Thesaurus |
| abbr. | down to pay part of the total cost of something, so that you can pay the rest later put something ↔ | put down on (belks) |
| abbr., insur. | TLO total | loss only |
| abbr., law | Total AMS | Total Aggregate Measurement of support |
| abbr., auto. | Total Chamber Deposit | TCD (I. Havkin) |
| abbr., astronaut. | Total Electron Content for Upper Atmosphere Investigations | TECUA |
| abbr., scottish | Total Environment Facility | TEF |
| avia. | total estimated elapsed time | For IFR flights, the estimated time required from take-off to arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the destination aerodrome, to arrive over the destination aerodrome. For VFR flights, the estimated time required from take-off to arrive over the destination aerodrome. |
| busin., abbr. | Total Focus Approach | TFA |
| abbr., ed. | Total Number of Credit | TNC (64$?) |
| avia. | total vertical error | The vertical geometric difference between the actual pressure altitude flown by an aircraft and its assigned pressure altitude (flight level). |