Related:

• OS /O-S/ 1. [Operating System] n. An abbreviation heavily used in email, occasionally in speech.
  2. n. obs. On ITS, an output spy. See "OS and JEDGAR" in Appendix A....
• OS: /O-S/ 1. [{Operating System}] n. An abbreviation heavily used in email, occasionally in speech.
  2. n.,obs. On ITS, an output spy. See "{OS and JEDGAR}" (in {Appendix A})....
• The three rules of international air travel: (1) Never fly on Aeroflot if you can possibly avoid it (this used to be Braniff or Aeroflot).
  (2) Never bet a whole lot of money on two little pairs unless you know *exactly* what you're doing....
• GCOS /jee'kohs/ n. A quick-and-dirty clone of System/360 DOS that emerged from GE around 1970
  originally called GECOS (the General Electric Comprehensive Operating System)....
• GCOS:: /jee'kohs/ n. A {quick-and-dirty} {clone} of System/360 DOS that emerged from GE around 1970
  originally called GECOS (the General Electric Comprehensive Operating System)....
• OS swapped to disk
• There's a reason why there's no "OS" in Windows...
• Windows rulz OS.
• ystem n. 1. The supervisor program or OS on a computer.
  2. The entire computer system, including input/output devices, the supervisor program or OS, and possibly other software....