TOS

from The Collaborative International Dictionary of English v.0.48

Vigesimo-quarto \Vi*ges"i*mo-quar"to\, n.; pl. {-tos}.
   A book composed of sheets each of which is folded into
   twenty-four leaves; hence, indicating more or less definitely
   a size of book so made; -- usually written 24mo, or 24[deg].
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Anito \A*ni"to\, n.; pl. {-tos}. [Sp.]
   In Guam and the Philippines, an idol, fetich, or spirit.
   [Webster 1913 Suppl.]

from Jargon File (4.4.4, 14 Aug 2003)

TOS
 vt.

   [from the acronym for `Terms Of Service' playing on the verb "toss"]

   1. The act of terminating an Internet access account because the owner
   breached the terms of service (e.g. by spamming).

   2. To successfully complain to the ISP for that reason so that they
   then close the account.

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

TOS

   <operating system> /toss/

   1. {IBM}'s {Tape Operating System}.

   2. The {operating system} of the {Atari} ST range of
   computers.  This range included the 512ST, 1040ST and the F,
   FM and E variations (e.g.1040STE).  Later, 32-bit machines
   (TT, Falcon030 and MegaSTE) were developed using a new version
   of TOS, called {MultiTOS} which was based on {MinT}.

   TOS went through several revisions starting initially as a
   derivative of {CP/M}, but developing into a remarkably
   complete and flexible operating system.  Features include: a
   {flat memory model}, {MS-DOS}-compatible disk format and
   support for {MIDI} and {SCSI} (in later versions).  TOS was
   designed to run Atari's version of the {GEM} {GUI}.

   There is some argument as to what TOS stands for, the main
   candidates being "Tramiel Operating System" (named after
   Atari's head at the time) or simply "The Operating System".

   3. <networking> {Terms Of Service}.

   4. Star Trek The Original Series as opposed to ST-TNG or
   ST-DS9.

   (1999-04-02)

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

TOS
       Tape Operating System (OS, RCA Spectra 70)

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

TOS
       Teletype Operating System (OS, Microdata)

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

TOS
       The Operating System (Atari, OS)

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

TOS
       Tramiel Operating System (Atari, OS)

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

TOS
       Type Of Service (IP)