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pe·ri·o·dic·i·ty AHD[pĭr'ē-ə-dĭsʹĭ-tē] D.J.[ˌpɪriːəˈdɪsɪtiː]K.K.[ˌpɪriəˈdɪsɪti]n.（名词）pl. pe.ri.o.dic.i.ties 【复数】- The quality or state of being periodic; recurrence at regular intervals.周期性：周期出现的性质或状态；以固定的间隔而发生
- The tendency of chemical elements with similar positions in the periodic table to have similar properties.周期律：化学元素在周期表中有相似位置时具有相似特性的趋势
- The position of an element in the periodic table.元素在周期表中的位置
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