Hypertext Webster Gateway: "Periodicities"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Periodicity \Pe`ri*o*dic"i*ty\, n.; pl. {Periodicities}. [Cf. F.
p['e]riodicit['e].]
The quality or state of being periodical, or regularly
recurrent; as, the periodicity in the vital phenomena of
plants. --Henfrey.
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