Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The set of routines stored in read-only memory that enable a computer to start the operating system and to communicate with the various devices in the system, such as disk drives, keyboard, monitor, printer, and communications ports.

from The Century Dictionary.

  • noun Living things considered collectively and in contrast with things that are not alive.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism computing Built-in operating system.
  • initialism computing Basic input/output system.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[b(asic) i(nput/)o(utput) s(ystem).]

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