co·ax·i·al

[koh-ak-see-uhl]
adjective
1.
Also, co·ax·al [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

co·ax·i·al·ly, adverb
un·co·ax·al, adjective
un·co·ax·i·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
coaxial or coaxal (kəʊˈæksɪəl, kəʊˈæksəl) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Coaxial is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

coaxial
1904, as a term in mathematics; coaxial cable is 1934. See com- + axis.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Initially, it was conceived to replace coaxial cables and remove the need to
  drill holes and string wires.
He attached the pulse generator to a coaxial cable that sent pulses to a copper
  loop antenna.
Their motion is driven by six computer-controlled motors attached to the
  gearbox by timing belts and the coaxial drive shafts.
Units are available for cable-television wire, called coaxial cable, as well as
  standard antenna wire.
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