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n. pl. pe·ri·o·dic·i·ties
1. The quality or state of being periodic; recurrence at regular intervals.
2. The repetition of similar properties in chemical elements, as indicated by their positioning in the periodic table.
pe•ri•o•dic•i•ty(ˌpɪər i əˈdɪs ɪ ti)
the character of being periodic; the tendency to recur at regular intervals.
[1825–35; < French périodicité]