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Definition: SOS

(1) (Silicon On Sapphire) An MOS chip-fabrication method that places a thin layer of silicon over a sapphire substrate (base). This technique was used for earlier LSI fabrication, but not considered useful for higher-density VLSI chips. See SOI.

(2) (Systems On Silicon) A complete system on a single chip. See SoC.

(3) (System Of Systems) An umbrella term for integrating and managing multiple independent, self-contained systems as a single entity.

(4) (Server Operating System) An operating system that resides on the server.

(5) (Sophisticated Operating System) The operating system in the Apple III. See Apple III.