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  1. Initialism of Global Telecommunications System, a worldwide network for the transmission of meteorological data from weather stations, satellites and numerical weather prediction centres.
  2. General Theological Seminary
  3. Gilles de la Tourette syndrome
  4. Great Trigonometric Survey
  5. green tobacco sickness
  6. Greenwich Time Signal



  1. geologic timescale
  2. (Internet) Giantess (as a sexual fetish).
    • 1997, "Wilfred D. DeVoe", Addresses of GTS & Tall Woman sites (on newsgroup
    • 1999, Katharine Gates, Deviant Desires: Incredibly Strange Sex
      INTERNET SEARCH KEYWORDS: GTS, macro, giantess, crush, trample. WHAT IT IS: A sexual fantasy of being tiny and at the mercy of a gigantic human.
    • 2006, Dominique Mainon, James Ursini, Modern Amazons: Warrior Women on Screen
      Technically the erotic obsession with such large women is labeled "macrophilia," but it is more commonly referred to as simply "GTS," short for giantess.