adjective: concentric circles all have the same center but different radius
Russell
"The formless zero universe is divided into four pairs of cubes and four pairs of spheres which are concentrically placed within each other. These four pairs of cube-spheres constitute one tonal octave of the universal harp. These tonal octaves are eight in number but appear to be nine for the first half of the ninth octave is the last of the first." [zero universe]
See Also
Concentric Rings
concentric waves of attraction
four concentric light rings