TAC

from The Collaborative International Dictionary of English v.0.48

Tac \Tac\, n. [Cf. {Tack}, n., 4.] (O. Eng. Law)
   A kind of customary payment by a tenant; -- a word used in
   old records. --Cowell. --Burrill.
   [1913 Webster] Tacamahac

from The Free On-line Dictionary of Computing (8 July 2008)

TAC

   1. Translator Assembler-Compiler.  For {Philco 2000}.

   2. {Terminal Access Controller}.

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

TAC
       Technical Assistance Center (Cisco)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

TAC
       Technology Access Center (Rogue-Wave)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

TAC
       Terminal Access Controller (ARPANET, MILNET)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

TAC
       Terminal Access Circuit

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

TAC
       Type Approval Code (IMEI, GSM, mobile-systems)