coaxial

[koh-ak-see-uhl]
adjective
1.
Also, coaxal [koh-ak-suhl] . having a common axis or coincident axes.
2.
Geometry.
a.
(of a set of circles) having the property that each pair of circles has the same radical axis.
b.
(of planes) intersecting in a straight line.
3.
(of a loudspeaker) having two or more cones with their centers mounted on the same axis.

Origin:
1880–85; co- + axial

coaxially, adverb
uncoaxal, adjective
uncoaxial, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coaxial or coaxal (kəʊˈæksɪəl, kəʊˈæksəl)
 
adj
1.  having or being mounted on a common axis
2.  geometry (of a set of circles) having all the centres on a straight line
3.  electronics formed from, using, or connected to a coaxial cable
 
coaxal or coaxal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

coaxial
1904, as a term in mathematics; coaxial cable is 1934. See com- + axis.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Their motion is driven by six computer-controlled motors attached to the
  gearbox by timing belts and the coaxial drive shafts.
The energy is then tapped and sent down a waveguide that is known as a coaxial
  cable to your television.
Signals through today's ubiquitous coaxial cables move at about two-thirds the
  speed of light.
He attached the pulse generator to a coaxial cable that sent pulses to a copper
  loop antenna.
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