| Acronym | Meaning |
| TDMS | Thermal Desorption Mass Spectrometry |
| TDO | Truncated Diatomic Orbital (a MO) |
| TDOPM | Time-dependent Optimized Potential Method |
| TDP | Total Dissolved Phosphorus |
| TDPAC | Time Differential Perturbed Angular Correlation |
| TDPAD | Time Differential Perturbed Angular Distribution |
| TDPT | Time-dependent Perturbation Theory |
| TDR | Time Domain Reflectometer |
| TDRH | Time-dependent Rotated Hartree (theory) |
| TDS | Thermal Desorption Spectrometry |
| TDS | Time-dependent Sudden |
| TDS | Total Dissolved Solids |
| TDSCF | Time-dependent Self-consistent Field |
| TDSE | Time-dependent Schroedinger Equation |
| TDSF | Time-dependent Spencer-Fano (in At. And Mol. Inelastic Collisions) |
| TDSHF | Time-dependent Screened Hartree-Fock |
| TDTF | Time-dependent Thomas-Fermi |
| TDVP | Time-dependent Variational Principle (in Scattering Calcns.) |
| TDVPT | Time-dependent Variation-perturbation Theory |
| TDWP | Time-dependent Wave Packet |
| TE | Thermionic Emission |
| TEA | Thermal Energy Analyzer |
| TEA | Transversely-excited Atmospheric Pressure |
| TEAM | Total Exposure Assessment Methodology |
| TEAM | Testing Electromagnetic Analysis Methods |
| TEAM | Thermal Energy Atomic And Molecular Beam Scattering |
| TEAMS | Trace Element Accelerator Mass Spectrometry |
| TEAS | Thermal Energy Atom Scattering |
| TEBAC | Benzyltriethylammonium Chloride |
| TEC | Transport Emergency Card |
| TEC | Teo Electron Counting Method (for Complexes |
| TEC | Thermal Expansion Coefficient |
| TECC | Tropospheric Effects Of Cloud Chemistry |
| TED | Thermal Electron Detectors |
| TED | Transmission Electron Diffraction |
| TEDE | Total Effective Dose Equivalent |
| TEDOR | Transferred Echo Double Resonance |
| TEDS | Timed Exposure Diffusive Sampler (for Air Pollution) |
| TEEL | Temporary Emergency Exposure Limit |
| TEELS | Transmission Electron Energy Loss Spectroscopy |
| TEER | Transepithelial Electric Resistance |
| TEF | Toxicity Equivalency Factor |
| TEG | Triethylene Glycol |
| TEIL | Two-electron Ionization Ladder (wave Function) |
| TEL | Tetraethyl Lead |
| TELD | Transferred-electron Logic Device |
| TELS | Transmission Energy Loss Spectroscopy |
| TEM | Transmission Electron Microscopy |
| TEMA | Tubular Exchanger Manufacturers Assocn. |
| TEMIS | Total Emissions Model For Integrated Systems |