|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|Compare eccentric having a common centre: concentric circles|
|[C14: from Medieval Latin concentricus, from Latin com- same + centrum|
concentric con·cen·tric (kən-sěn'trĭk)
Having a common center or center point, as of circles.