pe·​ri·​od·​ic·​i·​ty ˌpir-ē-ə-ˈdi-sə-tē How to pronounce periodicity (audio)
: the quality, state, or fact of being regularly recurrent or having periods

Examples of periodicity in a Sentence

Recent Examples on the Web But why does this roughly 800-year periodicity exist? Robin George Andrews, Quanta Magazine, 20 Feb. 2024 The thumb controlled the formant (that is, the amplitude peak in the spectrum that distinguishes the instrument’s timbre), the index finger controlled the waveform using a circular grid, and the three remaining fingers controlled the periodicity. IEEE Spectrum, 1 Feb. 2024 The key finding was that the spectrum of light from the star indicated that the 1.6-day periodicity is probably from a regular physical pulsing by the normal star in the HD 45166 system. John Timmer, Ars Technica, 17 Aug. 2023 Follow-on observations showed that the object repeated pretty regularly, with a periodicity of about 1,320 seconds (more commonly known as 22 minutes). John Timmer, Ars Technica, 19 July 2023 One of these relates to the periodicity of the patterns in this universe. The Physics Arxiv Blog, Discover Magazine, 13 Dec. 2023 At the summit, USGS scientists have been able to notice a periodicity to the earthquakes and explosions that occur until an explosion, then an abrupt drop in earthquakes before the cycle starts again. Erik Klemetti, Discover Magazine, 11 June 2018 Imagine chicken wire lattices layered on top of each other; these can be twisted one relative to another and form entirely new moiré scales of periodicity or non-periodicity. Adrienne Bernhard, Popular Mechanics, 15 June 2023 Their paper demonstrates that this hierarchy is the only way to tile the plane with hats, which amounts to proving that the shape will never slip into periodicity. Cody Cottier, Discover Magazine, 27 Apr. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'periodicity.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1820, in the meaning defined above

Time Traveler
The first known use of periodicity was in 1820

Dictionary Entries Near periodicity

Cite this Entry

“Periodicity.” Dictionary, Merriam-Webster, Accessed 16 Apr. 2024.

Medical Definition


pe·​ri·​od·​ic·​i·​ty ˌpir-ē-ə-ˈdis-ət-ē How to pronounce periodicity (audio)
plural periodicities
: the quality, state, or fact of being regularly recurrent or having periods
the periodicity of peptic ulcer is … characteristic of the diseaseJournal of the American Medical Association

More from Merriam-Webster on periodicity

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