There are multiple definitions:

1. transition time(English)

   • PRI, SDF, TRD

2. testosterone replacement therapy(English)

   • ERT, HRT
   • Andrology

3. test-retest [reliability / repeatability](English)

   • measures test consistency over time
   • Statistics
   • https://doi.org…271678X19879226
   • https://www.sta…st-reliability/

4. tinnitus retraining therapy(English)

   • refers to sound therapy (using amplification devices and/or sound generators) for tinnitus in adults
   • ENT, QOL, THI
   • Auditory system, Therapeutic approaches
   • https://doi.org…8.CD013094.pub2