|Adj.||1.||on-line - on a regular route of a railroad or bus or airline system; "on-line industries"|
off-line - not on a regular route of a transportation system; "an off-line ticket office"
|2.||on-line - connected to a computer network or accessible by computer; "an on-line database"|
off-line - not connected to a computer network; "off-line resources"
|3.||on-line - being in progress now; "on-line editorial projects"|
|(jargon)||on-line - 1. Ready for use. E.g. "The graph plotter's fixed
and on-line again".|
2. Interactive as opposed to batch. Accessible via a computer (or terminal), rather than on paper or other medium.
3. Of a user, actively using a computer system, especially the Internet. E.g "I haven't been on-line for three days."
"On-line" should be hyphenated because it is compounded from two words but the hyphen is often omitted in names of organisations or services.