1. (initialism) .  (biochemistry) adenosine triphosphate.
  2. (initialism) .  (tennis) Association of Tennis Professionals.
  3. (initialism) .  (context, railways) Automatic Train Protection.
  4. (initialism) .  (aviation) airline transport pilot (initialism of, airline transport pilot) .

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This entry was last updated on RefTopia from its source on 3/20/2012.