periodicity noun. [,pɪǝrɪǝ'dɪsɪti] M19.
[French périodicité, from Latin periodicus: see PERIODIC adjective¹, -ITY.]
1. a. Esp. Science. The quality or character of being periodic; tendency to recur at (esp. regular) intervals. M19.
b. Chemistry. The complex periodic variation of the properties of the chemical elements with increasing atomic number. L19.
c. The frequency of a periodic phenomenon, esp. an alternating current. E20.

2. Recurrence of a woman's periods; menstruation. M19.

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