iso·chro·nal /aɪˈsɑkrənḷ, ˌaɪsəˈkro-/
  (a.)等時[性] 的
  I·soch·ro·nal a.  Uniform in time; of equal time; performed in equal times; recurring at regular intervals; as, isochronal vibrations or oscillations.
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  isochronal
       adj : equal in duration or interval; "the oscillations were
             isochronal" [syn: isochronous]