from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A direct line between two telephone switchboards.
- n. The main line of a communications or transportation system.
from the GNU version of the Collaborative International Dictionary of English
- n. the main line of a railway, canal, or route of conveyance.
from The Century Dictionary and Cyclopedia
- n. In electricity, lines or wires which connect two telephone-exchanges, as distinguished from the wires which connect an exchange with its subscribers.
- n. The main line, as of a railway or canal, from which branch-lines diverge.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a telephone line connecting two exchanges directly
- n. line that is the main route on a railway
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