Etymology
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coaxial (adj.)

also co-axial, "having a common axis," 1850 as a term in mathematics; the coaxial cable, one containing several coaxial lines, is attested by that name from 1934. See co- + axial. Earlier coaxal (1847). Related: Coaxially; coaxiation.

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Definitions of coaxial

coaxial (adj.)
having a common axis;
Synonyms: coaxal
From wordnet.princeton.edu