(computing, transitive) To bring (a system, etc.) online; to promote to an active or running state.

An adjective "online" refers to a system, generator, power plant, or computer that is connected to a larger network or actively connected to the internet or some other communications service.

Available over, or delivered from, the Internet.

Connected to the Internet.

Available on a computer system, even if not networked.

Of a system: active, particularly building facilities (such as power) or a factory or power plant.

(slang) Immersed in Internet culture. (Usually modified by an intensifier such as extremely or terminally)

While online; while in a running or active state, or connected to the Internet.