More specifically, periodicity usually refers to the repetition of patterns among periods (or rows) in the periodic table.
Pe`ri*o*dic"i*ty (?), n.; pl. Periodicities (#). [Cf. F. p'eriodicit'e.]
The quality or state of being periodical, or regularly recurrent; as, the periodicity in the vital phenomena of plants.
© Webster 1913.
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