1) Coaxal 2) Coaxial 3) Concentric 4) Concentrical 5) Having a common center 
having the same central or focal point
• (a.) Having the same center.
Having the same centre; denoting rays that meet at a common focus. ... Compare: heterocentric. ... (05 Mar 2000) ... 
(ho″mo-sen´trik) having the same center or focus.
Ho`mo·cen'tric adjective [ Greek ...: ... the same + ... center: confer French homocentrique .] Having the same center. 
Type: Term Pronunciation: hō′mō-sen′trik Definitions: 1. Having the same center; denoting rays that meet at a common focus.
homocentric Used to describe circles and spheres that have the same center.
having a common center; concentric. · diverging from or converging to the same point: homocentric rays.