offline

Short definition from Wiktionary

Adjective

1. 1
   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.
2. 2
   Happening in the physical world (the real world) as opposed to on the internet.

Adverb

1. 1
   While offline; with an offline system.
2. 2
   Outside the current meeting, in a more private setting.

Verb

1. 1
   To take (a system, etc.) offline; to demote from an active or online state.
2. 2
   To raid another player's base while that player is not currently playing.