Definitions

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

  • adj. Not under the control of a central computer, as in a manufacturing process or experiment.
  • adj. Not connected to a computer or computer network.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of a system, currently not connected (generally electrically) to a larger network. For example, a power plant which is not connected to the grid, or a computer which is not connected to the Internet or to any other communications service.
  • adj. Happening in the physical world (the real world) as opposed to on the internet.
  • adv. While offline; with an offline system.
  • adv. Outside the current meeting, in a more private setting.

Etymologies

off +‎ line (Wiktionary)

Examples

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