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2 definitions found From WordNet r 1.6 [wn]: on-line adj 1: (transportation) on a regular route of a railroad or bus or airline system; "on-line industries" [ant: {off-line}] 2: (computer sci) connected to a computer network or accessible by computer; "an on-line database" [ant: {off-line}] 3: being in progress now "on-line editorial projects" [syn: {on-line(a)}] From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]: on-line1. 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. (1998-12-22)