Concentric

Con`cen´tric

a.	1.	Having a common center, as circles of different size, one within another. Concentric circles upon the surface of the water. - Sir I. Newton. Concentrical rings like those of an onion. - Arbuthnot.
n.	1.	That which has a common center with something else. Its pecular relations to its concentrics. - Coleridge.

Adj.

concentric - having a common center; "concentric rings"

Synonyms: concentrical, homocentric

Antonyms:

nonconcentric, eccentric - not having a common center; not concentric; "eccentric circles"