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See also: periòdic


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Alternative forms[edit]

Etymology 1[edit]

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


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.
    Synonyms: cyclic; see also Thesaurus:periodic
  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 time steps, for some .
    Antonym: aperiodic
  7. (rhetoric) Having a structure characterized by periodic sentences.
Derived terms[edit]
Related terms[edit]
The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.

Etymology 2[edit]

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.
Derived terms[edit]




periodic m pl

  1. plural of periodich