The word "coaxial" means that two things are aligned and share the same axis or center point. For example, if you have a coaxial cable, it means that the inner wire and outer shield of the cable are positioned along the same line. Full definition
The antenna comes with 16 feet of coaxial cable and rounded easy - twist connectors on each end. (cordcuttingreport.com)
We also have a digital coaxial input which functions similarly with sources that don't support optical. (theheadphonelist.com)
We connected it via the provided digital optical cable directly to a PlayStation 3 and, later, an Xbox 360, since our two Sharp LC - 42SB45U TVs require a sort of break - out cable for coaxial digital audio output. (digitaltrends.com)