tac

noun2

1. •
   (slang) The drug cannabis.
2. •
   The clicking sound of a keyboard.

adjective1

1. •
   Abbreviation of tactical.

noun3

1. •
   (US) Clipping of tactical officer.

   • Darrell S. Mudd, The Boys of Chattahoochee: Sons of the Greatest Generation There were six tactical officers (TACs) in 95th Company, each in charge of a platoon of 40 officer candidates. TACs were not responsible for classroom or field instruction, as their title might suggest, […]
2. •
   (US) Acronym of tactical air command.
3. •
   Abbreviation of tacrolimus.