online

1
Of a system: connected (generally electrically) to a larger network.
2
Available over, or delivered from, the Internet.
In America alone, people spent $170 billion on “direct marketing”—junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result. If the bumf arrived electronically, the take-up rate was 0.1%. And for online adverts the “conversion” into sales was a minuscule 0.01%.
3
Connected to the Internet.
I'll be online tonight, so I'll be able to reply to your email.

adv

1
While online; while in a running or active state, or connected to the Internet.
He works online.

1
To bring (a system, etc.) online; to promote to an active or running state.
The output in Listing 8-2 shows your disk group status prior to onlining the disks, the commands to online your disks, and the status after onlining.

Definitions