periodic

• periodick (obsolete)

From French périodique, from Medieval Latin periodicus (“cyclical”), from Latin periodus (“complete sentence, period, circuit”), from Ancient Greek περίοδος (períodos, “cycle, period of time”).

A graph of the sine function, a periodic function

• (Received Pronunciation) IPA^(key): /ˌpɪɹiˈɒdɪk/, /ˌpɪə-/
• (General American) IPA^(key): /ˌpɪɹiˈɑdɪk/

• Audio (GA)

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• Rhymes: -ɒdɪk
• Hyphenation: pe‧ri‧od‧ic

periodic (not comparable)

1. Relative to a period or periods.
2. Having repeated cycles.
   • 1899, Stephen Crane, chapter 1, in Twelve O'Clock:

     There was some laughter, and Roddle was left free to expand his ideas on the periodic visits of cowboys to the town. “Mason Rickets, he had ten big punkins a-sittin' in front of his store, an' them fellers from the Upside-down-F ranch shot 'em up […].”

   Synonym: cyclic

3. Occurring at regular intervals.
4. Periodical.
5. (astronomy) Pertaining to the revolution of a celestial object in its orbit.

   Antonym: non-periodic

6. (mathematics, stochastic processes, of a state) For which any return to it must occur in multiples of ${\displaystyle k}$ time steps, for some ${\displaystyle k>1}$ .

   Antonym: aperiodic

7. (rhetoric) Having a structure characterized by periodic sentences.

From per- +‎ iodic.

• enPR: "pûrīŏd'ĭk, IPA^(key): /ˌpɜːɹaɪˈɒdɪk/

periodic (not comparable)

1. Relating to the highest oxidation state of iodine; Of or derived from a periodic acid.

periodic m pl

1. plural of periodich