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You will learn this in geometry.

Concentric means "sharing the same center". Con- = used multiple times, -Centric = center-related. (like cooperate: multiple people doing the same task)

So, it's like a dartboard or bullseye: the circles are all around the same point.

Something three-dimensional, like cylinders (water bottles, spray cans), may be coaxial.
The solar system is concentric. All the planets orbit the sun.

A properly set table has the bowls and plates concentric.
by Solomon H February 13, 2006
8 1