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on-line

[on-lahyn, awn-]
adjective
1.
operating under the direct control of, or connected to, a main computer.
2.
connected by computer to one or more other computers or networks, as through a commercial electronic information service or the Internet.
3.
of or denoting a business that transmits electronic information over telecommunications lines: an on-line bookstore.
4.
available or operating on a computer or computer network: an on-line dictionary.
5.
by means of or using a computer: on-line shopping.
6.
Radio. (of a network) supplying affiliated stations with all or a substantial part of their programming.
7.
Television. of or pertaining to the final editing of a videotaped program.
8.
done or accomplished while in operation or active service: on-line maintenance.
9.
located on major routes or rail lines: on-line industries.
adverb
10.
with or through a computer, especially over a network.
Also, online, on line.
Compare off-line.


Origin:
1945–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
on-line

adjective
1. on a regular route of a railroad or bus or airline system; "on-line industries" [ant: off-line
2. 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" 
WordNet® 3.0, © 2006 by Princeton University.
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