the character of being periodic; the tendency to recur at regular intervals.

1825–35; < French périodicité. See periodic1, -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
periodic (ˌpɪərɪˈɒdɪk)
1.  happening or recurring at intervals; intermittent
2.  of, relating to, or resembling a period
3.  having or occurring in repeated periods or cycles

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

periodicity pe·ri·o·dic·i·ty (pĭr'ē-ə-dĭs'ĭ-tē)

  1. The quality or state of being periodic; recurrence at regular intervals.

  2. The tendency of chemical elements to have similar properties when arranged according to their atomic number.

  3. The position of an element in the periodic table.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These variations appear to have a periodicity of several hundred years, with several temperature peaks and dips.
Beyond the obvious periodicity of the pulse, an uninitiated viewer sees nothing but irregular noise.
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