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.

While offline; with an offline system. / (business slang) Outside the current meeting, in a more private setting. / From ("off") the Internet

(computing, transitive) To take (a system, etc.) offline; to demote from an active or online state.

simple past tense and past participle of offline

Third-person singular simple present indicative form of offline

(Internet, software, very rare) Capable of being used offline to some degree.

plural of offliner

A person who is offline; one not using the Internet or similar service.

present participle of offline

(computing) A single-executable installer for a program that already contains the full program. It does not need to connect to the Internet.