a system of conductors, as coaxial cable, a wave guide, or a pair of parallel wires, used to transmit signals.
Origin of transmission line
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for transmission line
a coaxial cable, waveguide, or other system of conductors that transfers electrical signals from one location to anotherSometimes shortened to: line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012