Online meaning : To bring (a system, etc.) online; to promote to an active or running state. Of a system: connected (generally electrically) to a larger network. 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. While online; while in a running or active state, or connected to the Internet.