co·e·ta·ne·ous /ˌkoəˈteniəs/
  (a.)同時代的
  Co·e·ta·ne·ous a.  Of the same age; beginning to exist at the same time; contemporaneous.
  -- Co*e*ta*ne*ous*ly, adv.
     And all [members of the body] are coetaneous.   --Bentley.
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  coetaneous
       adj : of the same period [syn: coeval, contemporaneous]