Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A direct line between two telephone switchboards.
  • noun The main line of a communications or transportation system.

from The Century Dictionary.

  • noun In electricity, lines or wires which connect two telephone-exchanges, as distinguished from the wires which connect an exchange with its subscribers.
  • noun 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.

  • noun a telephone line connecting two exchanges directly
  • noun line that is the main route on a railway

Etymologies

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Examples

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