pe·ri·od·ic·i·ty /ˌpɪriəˈdɪsəti/
  定期性,週期性,週期數
  pe·ri·od·ic·i·ty /ˌpɪrɪəˈdɪsətɪ/ 名詞
  週期(性),週期數,間歇性,循環性,頻率,周率
  periodicity
  週期性
  periodicity
  擬週期性
  Pe·ri·o·dic·i·ty n.; pl. Periodicities   The quality or state of being periodical, or regularly recurrent; as, the periodicity in the vital phenomena of plants.
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  periodicity
       n : the quality of recurring at intervals [syn: cyclicity]