Pe′ri‐o‐dic″i‐ty (?), n.; pl.Periodicities (#). [Cf. F. périodicité.] The quality or state of being periodical, or regularly recurrent; as, the periodicity in the vital phenomena of plants. Henfrey.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.